diff --git a/apps/bff/src/modules/subscriptions/sim-management.service.ts b/apps/bff/src/modules/subscriptions/sim-management.service.ts
index 716a3cba..cb019fc3 100644
--- a/apps/bff/src/modules/subscriptions/sim-management.service.ts
+++ b/apps/bff/src/modules/subscriptions/sim-management.service.ts
@@ -1,7 +1,7 @@
 import { Injectable } from "@nestjs/common";
 import { SimOrchestratorService } from "./sim-management/services/sim-orchestrator.service";
 import { SimNotificationService } from "./sim-management/services/sim-notification.service";
-import type { SimDetails, SimTopUpHistory, SimUsage } from "@customer-portal/domain/sim";
+import type { SimDetails, SimInfo, SimTopUpHistory, SimUsage } from "@customer-portal/domain/sim";
 import type {
   SimTopUpRequest,
   SimPlanChangeRequest,
@@ -123,10 +123,7 @@ export class SimManagementService {
   async getSimInfo(
     userId: string,
     subscriptionId: number
-  ): Promise<{
-    details: SimDetails;
-    usage: SimUsage;
-  }> {
+  ): Promise<SimInfo> {
     return this.simOrchestrator.getSimInfo(userId, subscriptionId);
   }
 
diff --git a/apps/bff/src/modules/subscriptions/sim-management/services/sim-orchestrator.service.ts b/apps/bff/src/modules/subscriptions/sim-management/services/sim-orchestrator.service.ts
index e3f6121a..0cbbf0c0 100644
--- a/apps/bff/src/modules/subscriptions/sim-management/services/sim-orchestrator.service.ts
+++ b/apps/bff/src/modules/subscriptions/sim-management/services/sim-orchestrator.service.ts
@@ -8,7 +8,8 @@ import { SimCancellationService } from "./sim-cancellation.service";
 import { EsimManagementService } from "./esim-management.service";
 import { SimValidationService } from "./sim-validation.service";
 import { getErrorMessage } from "@bff/core/utils/error.util";
-import type { SimDetails, SimTopUpHistory, SimUsage } from "@customer-portal/domain/sim";
+import { simInfoSchema } from "@customer-portal/domain/sim";
+import type { SimInfo, SimDetails, SimTopUpHistory, SimUsage } from "@customer-portal/domain/sim";
 import type {
   SimTopUpRequest,
   SimPlanChangeRequest,
@@ -113,10 +114,7 @@ export class SimOrchestratorService {
   async getSimInfo(
     userId: string,
     subscriptionId: number
-  ): Promise<{
-    details: SimDetails;
-    usage: SimUsage;
-  }> {
+  ): Promise<SimInfo> {
     try {
       const [details, usage] = await Promise.all([
         this.getSimDetails(userId, subscriptionId),
@@ -141,7 +139,7 @@ export class SimOrchestratorService {
         }
       }
 
-      return { details, usage };
+      return simInfoSchema.parse({ details, usage });
     } catch (error) {
       const sanitizedError = getErrorMessage(error);
       this.logger.error(`Failed to get comprehensive SIM info for subscription ${subscriptionId}`, {
diff --git a/apps/bff/src/modules/subscriptions/subscriptions.controller.ts b/apps/bff/src/modules/subscriptions/subscriptions.controller.ts
index de427f27..a6fe8d4b 100644
--- a/apps/bff/src/modules/subscriptions/subscriptions.controller.ts
+++ b/apps/bff/src/modules/subscriptions/subscriptions.controller.ts
@@ -33,6 +33,7 @@ import {
   simCancelRequestSchema,
   simFeaturesRequestSchema,
   simReissueRequestSchema,
+  type SimInfo,
   type SimTopupRequest,
   type SimChangePlanRequest,
   type SimCancelRequest,
@@ -109,7 +110,7 @@ export class SubscriptionsController {
   async getSimInfo(
     @Request() req: RequestWithUser,
     @Param("id", ParseIntPipe) subscriptionId: number
-  ) {
+  ): Promise<SimInfo> {
     return this.simManagementService.getSimInfo(req.user.id, subscriptionId);
   }
 
diff --git a/apps/bff/src/modules/subscriptions/subscriptions.service.ts b/apps/bff/src/modules/subscriptions/subscriptions.service.ts
index e9312a2f..77a42487 100644
--- a/apps/bff/src/modules/subscriptions/subscriptions.service.ts
+++ b/apps/bff/src/modules/subscriptions/subscriptions.service.ts
@@ -5,6 +5,7 @@ import {
   SubscriptionList,
   subscriptionListSchema,
   subscriptionStatusSchema,
+  subscriptionStatsSchema,
   type SubscriptionStatus,
 } from "@customer-portal/domain/subscriptions";
 import type { Invoice, InvoiceItem, InvoiceList } from "@customer-portal/domain/billing";
@@ -201,7 +202,7 @@ export class SubscriptionsService {
 
       this.logger.log(`Generated subscription stats for user ${userId}`, stats);
 
-      return stats;
+      return subscriptionStatsSchema.parse(stats);
     } catch (error) {
       this.logger.error(`Failed to generate subscription stats for user ${userId}`, {
         error: getErrorMessage(error),
diff --git a/apps/bff/src/modules/users/users.service.ts b/apps/bff/src/modules/users/users.service.ts
index 83a2df27..213ca623 100644
--- a/apps/bff/src/modules/users/users.service.ts
+++ b/apps/bff/src/modules/users/users.service.ts
@@ -17,6 +17,7 @@ import {
 import type { Subscription } from "@customer-portal/domain/subscriptions";
 import type { Invoice } from "@customer-portal/domain/billing";
 import type { Activity, DashboardSummary, NextInvoice } from "@customer-portal/domain/dashboard";
+import { dashboardSummarySchema } from "@customer-portal/domain/dashboard";
 import { WhmcsService } from "@bff/integrations/whmcs/whmcs.service";
 import { SalesforceService } from "@bff/integrations/salesforce/salesforce.service";
 import { MappingsService } from "@bff/modules/id-mappings/mappings.service";
@@ -525,7 +526,7 @@ export class UsersService {
         nextInvoice,
         recentActivity,
       };
-      return summary;
+      return dashboardSummarySchema.parse(summary);
     } catch (error) {
       this.logger.error(`Failed to get user summary for ${userId}`, {
         error: getErrorMessage(error),
diff --git a/apps/portal/src/features/account/components/AddressCard.tsx b/apps/portal/src/features/account/components/AddressCard.tsx
index 18331d52..215b1865 100644
--- a/apps/portal/src/features/account/components/AddressCard.tsx
+++ b/apps/portal/src/features/account/components/AddressCard.tsx
@@ -4,6 +4,7 @@ import { SubCard } from "@/components/molecules/SubCard/SubCard";
 import { MapPinIcon, PencilIcon, CheckIcon, XMarkIcon } from "@heroicons/react/24/outline";
 import { AddressForm, type AddressFormProps } from "@/features/catalog/components";
 import type { Address } from "@customer-portal/domain/customer";
+import { getCountryName } from "@/lib/constants/countries";
 
 interface AddressCardProps {
   address: Address;
@@ -26,6 +27,9 @@ export function AddressCard({
   onSave,
   onAddressChange,
 }: AddressCardProps) {
+  const countryLabel =
+    address.country ? getCountryName(address.country) ?? address.country : null;
+
   return (
     <SubCard>
       <div className="pb-5 border-b border-gray-200">
@@ -88,7 +92,7 @@ export function AddressCard({
                 {[address.city, address.state, address.postcode].filter(Boolean).join(", ")}
               </p>
             )}
-            {address.country && <p className="text-gray-600 font-medium">{address.country}</p>}
+            {countryLabel && <p className="text-gray-600 font-medium">{countryLabel}</p>}
           </div>
         )}
       </div>
diff --git a/apps/portal/src/features/auth/components/SignupForm/AddressStep.tsx b/apps/portal/src/features/auth/components/SignupForm/AddressStep.tsx
index 1dade10c..ae1e459e 100644
--- a/apps/portal/src/features/auth/components/SignupForm/AddressStep.tsx
+++ b/apps/portal/src/features/auth/components/SignupForm/AddressStep.tsx
@@ -11,29 +11,7 @@ import { FormField } from "@/components/molecules/FormField/FormField";
 import type { FormErrors, FormTouched, UseZodFormReturn } from "@customer-portal/validation";
 import type { SignupFormValues } from "./SignupForm";
 import type { Address } from "@customer-portal/domain/customer";
-
-const COUNTRIES = [
-  { code: "US", name: "United States" },
-  { code: "CA", name: "Canada" },
-  { code: "GB", name: "United Kingdom" },
-  { code: "AU", name: "Australia" },
-  { code: "DE", name: "Germany" },
-  { code: "FR", name: "France" },
-  { code: "IT", name: "Italy" },
-  { code: "ES", name: "Spain" },
-  { code: "NL", name: "Netherlands" },
-  { code: "SE", name: "Sweden" },
-  { code: "NO", name: "Norway" },
-  { code: "DK", name: "Denmark" },
-  { code: "FI", name: "Finland" },
-  { code: "CH", name: "Switzerland" },
-  { code: "AT", name: "Austria" },
-  { code: "BE", name: "Belgium" },
-  { code: "IE", name: "Ireland" },
-  { code: "PT", name: "Portugal" },
-  { code: "GR", name: "Greece" },
-  { code: "JP", name: "Japan" },
-];
+import { COUNTRY_OPTIONS } from "@/lib/constants/countries";
 
 interface AddressStepProps {
   address: SignupFormValues["address"];
@@ -53,7 +31,19 @@ export function AddressStep({
   // Use domain Address type directly - no type helpers needed
   const updateAddressField = useCallback(
     (field: keyof Address, value: string) => {
-      onAddressChange({ ...address, [field]: value });
+      onAddressChange({ ...(address ?? {}), [field]: value });
+    },
+    [address, onAddressChange]
+  );
+
+  const handleCountryChange = useCallback(
+    (code: string) => {
+      const normalized = code || "";
+      onAddressChange({
+        ...(address ?? {}),
+        country: normalized,
+        countryCode: normalized,
+      });
     },
     [address, onAddressChange]
   );
@@ -139,13 +129,13 @@ export function AddressStep({
         <FormField label="Country" error={getFieldError("country")} required>
           <select
             value={address?.country || ""}
-            onChange={e => updateAddressField("country", e.target.value)}
+            onChange={e => handleCountryChange(e.target.value)}
             onBlur={markTouched}
             className="block w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-blue-500 focus:border-blue-500"
           >
             <option value="">Select a country</option>
-            {COUNTRIES.map(country => (
-              <option key={country.code} value={country.name}>
+            {COUNTRY_OPTIONS.map(country => (
+              <option key={country.code} value={country.code}>
                 {country.name}
               </option>
             ))}
diff --git a/apps/portal/src/features/auth/components/SignupForm/SignupForm.tsx b/apps/portal/src/features/auth/components/SignupForm/SignupForm.tsx
index b054c2d2..a48100d6 100644
--- a/apps/portal/src/features/auth/components/SignupForm/SignupForm.tsx
+++ b/apps/portal/src/features/auth/components/SignupForm/SignupForm.tsx
@@ -17,6 +17,7 @@ import { MultiStepForm, type FormStep } from "./MultiStepForm";
 import { AddressStep } from "./AddressStep";
 import { PasswordStep } from "./PasswordStep";
 import { PersonalStep } from "./PersonalStep";
+import { getCountryCodeByName } from "@/lib/constants/countries";
 
 interface SignupFormProps {
   onSuccess?: () => void;
@@ -64,10 +65,30 @@ export function SignupForm({
     async ({ confirmPassword: _confirm, ...formData }: SignupFormValues) => {
       clearError();
       try {
+        const normalizeCountryCode = (value?: string) => {
+          if (!value) return "";
+          if (value.length === 2) return value.toUpperCase();
+          return getCountryCodeByName(value) ?? value;
+        };
+
+        const normalizedAddress = formData.address
+          ? (() => {
+              const countryValue =
+                formData.address.country || formData.address.countryCode || "";
+              const normalizedCountry = normalizeCountryCode(countryValue);
+              return {
+                ...formData.address,
+                country: normalizedCountry,
+                countryCode: normalizedCountry,
+              };
+            })()
+          : undefined;
+
         // Remove confirmPassword and create SignupRequest
         // The signup hook will handle API format transformation
         const request: SignupRequest = {
           ...formData,
+          ...(normalizedAddress ? { address: normalizedAddress } : {}),
           // API expects both camelCase and snake_case (for WHMCS compatibility)
           firstname: formData.firstName,
           lastname: formData.lastName,
@@ -112,6 +133,7 @@ export function SignupForm({
         state: "",
         postcode: "",
         country: "",
+        countryCode: "",
       },
       nationality: "",
       dateOfBirth: "",
diff --git a/apps/portal/src/features/catalog/components/base/AddressConfirmation.tsx b/apps/portal/src/features/catalog/components/base/AddressConfirmation.tsx
index 352b0deb..f1cb2b79 100644
--- a/apps/portal/src/features/catalog/components/base/AddressConfirmation.tsx
+++ b/apps/portal/src/features/catalog/components/base/AddressConfirmation.tsx
@@ -16,6 +16,7 @@ import {
   XMarkIcon,
   ExclamationTriangleIcon,
 } from "@heroicons/react/24/outline";
+import { getCountryName } from "@/lib/constants/countries";
 
 // Use canonical Address type from domain
 import type { Address } from "@customer-portal/domain/customer";
@@ -55,28 +56,35 @@ export function AddressConfirmation({
     try {
       setLoading(true);
       const data = await accountService.getAddress();
+      const normalizedAddress = data
+        ? {
+            ...data,
+            country: data.country ?? "",
+            countryCode: data.countryCode ?? data.country ?? "",
+          }
+        : null;
       const isComplete = !!(
-        data &&
-        data.address1 &&
-        data.city &&
-        data.state &&
-        data.postcode &&
-        data.country
+        normalizedAddress &&
+        normalizedAddress.address1 &&
+        normalizedAddress.city &&
+        normalizedAddress.state &&
+        normalizedAddress.postcode &&
+        normalizedAddress.country
       );
 
       setBillingInfo({
         company: null,
         email: "",
         phone: null,
-        address: data,
+        address: normalizedAddress,
         isComplete,
       });
 
       if (requiresAddressVerification) {
         setAddressConfirmed(false);
         onAddressIncomplete();
-      } else if (isComplete && data) {
-        onAddressConfirmed(data);
+      } else if (isComplete && normalizedAddress) {
+        onAddressConfirmed(normalizedAddress);
         setAddressConfirmed(true);
       } else {
         onAddressIncomplete();
@@ -107,6 +115,7 @@ export function AddressConfirmation({
         state: "",
         postcode: "",
         country: "",
+        countryCode: "",
       }
     );
   };
@@ -142,6 +151,7 @@ export function AddressConfirmation({
           state: editedAddress.state?.trim() || null,
           postcode: editedAddress.postcode?.trim() || null,
           country: editedAddress.country?.trim() || null,
+          countryCode: editedAddress.country?.trim() || null,
         };
 
         // Persist to server (WHMCS via BFF)
@@ -231,6 +241,8 @@ export function AddressConfirmation({
   if (!billingInfo) return null;
 
   const address = billingInfo.address;
+  const countryLabel =
+    address?.country ? getCountryName(address.country) ?? address.country : null;
 
   return wrap(
     <>
@@ -343,7 +355,10 @@ export function AddressConfirmation({
               value={editedAddress?.country || ""}
               onChange={e => {
                 setError(null);
-                setEditedAddress(prev => (prev ? { ...prev, country: e.target.value } : null));
+                const next = e.target.value;
+                setEditedAddress(prev =>
+                  prev ? { ...prev, country: next, countryCode: next } : null
+                );
               }}
               className="w-full px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"
             >
@@ -388,7 +403,7 @@ export function AddressConfirmation({
                   {[address.city, address.state].filter(Boolean).join(", ")}
                   {address.postcode ? ` ${address.postcode}` : ""}
                 </p>
-                <p className="text-gray-600">{address.country}</p>
+                {countryLabel && <p className="text-gray-600">{countryLabel}</p>}
               </div>
 
               {/* Status message for Internet orders when pending */}
diff --git a/apps/portal/src/features/dashboard/hooks/useDashboardSummary.ts b/apps/portal/src/features/dashboard/hooks/useDashboardSummary.ts
index 70a58b7b..58b20d55 100644
--- a/apps/portal/src/features/dashboard/hooks/useDashboardSummary.ts
+++ b/apps/portal/src/features/dashboard/hooks/useDashboardSummary.ts
@@ -5,8 +5,12 @@
 
 import { useQuery } from "@tanstack/react-query";
 import { useAuthSession } from "@/features/auth/services/auth.store";
-import { apiClient, queryKeys, getDataOrThrow } from "@/lib/api";
-import type { DashboardSummary, DashboardError } from "@customer-portal/domain/dashboard";
+import { apiClient, queryKeys } from "@/lib/api";
+import {
+  dashboardSummarySchema,
+  type DashboardSummary,
+  type DashboardError,
+} from "@customer-portal/domain/dashboard";
 
 class DashboardDataError extends Error {
   constructor(
@@ -37,7 +41,21 @@ export function useDashboardSummary() {
 
       try {
         const response = await apiClient.GET<DashboardSummary>("/api/me/summary");
-        return getDataOrThrow<DashboardSummary>(response, "Dashboard summary response was empty");
+        if (!response.data) {
+          throw new DashboardDataError(
+            "FETCH_ERROR",
+            "Dashboard summary response was empty"
+          );
+        }
+        const parsed = dashboardSummarySchema.safeParse(response.data);
+        if (!parsed.success) {
+          throw new DashboardDataError(
+            "FETCH_ERROR",
+            "Dashboard summary response failed validation",
+            { issues: parsed.error.issues }
+          );
+        }
+        return parsed.data;
       } catch (error) {
         // Transform API errors to DashboardError format
         if (error instanceof Error) {
diff --git a/apps/portal/src/features/sim-management/components/DataUsageChart.tsx b/apps/portal/src/features/sim-management/components/DataUsageChart.tsx
index 4fe871cc..c0a8fa56 100644
--- a/apps/portal/src/features/sim-management/components/DataUsageChart.tsx
+++ b/apps/portal/src/features/sim-management/components/DataUsageChart.tsx
@@ -2,18 +2,7 @@
 
 import React from "react";
 import { ChartBarIcon, ExclamationTriangleIcon } from "@heroicons/react/24/outline";
-
-export interface SimUsage {
-  account: string;
-  todayUsageKb: number;
-  todayUsageMb: number;
-  recentDaysUsage: Array<{
-    date: string;
-    usageKb: number;
-    usageMb: number;
-  }>;
-  isBlacklisted: boolean;
-}
+import type { SimUsage } from "@customer-portal/domain/sim";
 
 interface DataUsageChartProps {
   usage: SimUsage;
diff --git a/apps/portal/src/features/sim-management/components/SimManagementSection.tsx b/apps/portal/src/features/sim-management/components/SimManagementSection.tsx
index ed6b18c3..79dae40c 100644
--- a/apps/portal/src/features/sim-management/components/SimManagementSection.tsx
+++ b/apps/portal/src/features/sim-management/components/SimManagementSection.tsx
@@ -7,21 +7,16 @@ import {
   ArrowPathIcon,
 } from "@heroicons/react/24/outline";
 import { SimDetailsCard } from "./SimDetailsCard";
-import { DataUsageChart, type SimUsage } from "./DataUsageChart";
+import { DataUsageChart } from "./DataUsageChart";
 import { SimActions } from "./SimActions";
 import { apiClient } from "@/lib/api";
 import { SimFeatureToggles } from "./SimFeatureToggles";
-import type { SimDetails } from "@customer-portal/domain/sim";
+import { simInfoSchema, type SimInfo } from "@customer-portal/domain/sim";
 
 interface SimManagementSectionProps {
   subscriptionId: number;
 }
 
-interface SimInfo {
-  details: SimDetails;
-  usage: SimUsage;
-}
-
 export function SimManagementSection({ subscriptionId }: SimManagementSectionProps) {
   const [simInfo, setSimInfo] = useState<SimInfo | null>(null);
   const [loading, setLoading] = useState(true);
@@ -31,16 +26,16 @@ export function SimManagementSection({ subscriptionId }: SimManagementSectionPro
     try {
       setError(null);
 
-      const response = await apiClient.GET("/api/subscriptions/{id}/sim", {
+      const response = await apiClient.GET<SimInfo>("/api/subscriptions/{id}/sim", {
         params: { path: { id: subscriptionId } },
       });
 
-      const payload = response.data as SimInfo | undefined;
-
-      if (!payload) {
+      if (!response.data) {
         throw new Error("Failed to load SIM information");
       }
 
+      const payload = simInfoSchema.parse(response.data);
+
       setSimInfo(payload);
     } catch (err: unknown) {
       const hasStatus = (value: unknown): value is { status: number } =>
diff --git a/apps/portal/src/features/subscriptions/containers/SimCancel.tsx b/apps/portal/src/features/subscriptions/containers/SimCancel.tsx
index 65cc34cb..f96ba73f 100644
--- a/apps/portal/src/features/subscriptions/containers/SimCancel.tsx
+++ b/apps/portal/src/features/subscriptions/containers/SimCancel.tsx
@@ -48,7 +48,7 @@ export function SimCancelContainer() {
   useEffect(() => {
     const fetchDetails = async () => {
       try {
-        const info = await simActionsService.getSimInfo<SimDetails, unknown>(subscriptionId);
+        const info = await simActionsService.getSimInfo(subscriptionId);
         setDetails(info?.details || null);
       } catch (e: unknown) {
         setError(e instanceof Error ? e.message : "Failed to load SIM details");
diff --git a/apps/portal/src/features/subscriptions/hooks/useSubscriptions.ts b/apps/portal/src/features/subscriptions/hooks/useSubscriptions.ts
index bbef3cb6..9b5d1e97 100644
--- a/apps/portal/src/features/subscriptions/hooks/useSubscriptions.ts
+++ b/apps/portal/src/features/subscriptions/hooks/useSubscriptions.ts
@@ -8,19 +8,17 @@ import { apiClient, queryKeys, getDataOrDefault, getDataOrThrow } from "@/lib/ap
 import { getNullableData } from "@/lib/api/response-helpers";
 import { useAuthSession } from "@/features/auth/services";
 import type { InvoiceList } from "@customer-portal/domain/billing";
-import type { Subscription, SubscriptionList } from "@customer-portal/domain/subscriptions";
+import {
+  subscriptionStatsSchema,
+  type Subscription,
+  type SubscriptionList,
+  type SubscriptionStats,
+} from "@customer-portal/domain/subscriptions";
 
 interface UseSubscriptionsOptions {
   status?: string;
 }
 
-const emptyStats = {
-  total: 0,
-  active: 0,
-  completed: 0,
-  cancelled: 0,
-};
-
 const emptyInvoiceList: InvoiceList = {
   invoices: [],
   pagination: {
@@ -76,11 +74,14 @@ export function useActiveSubscriptions() {
 export function useSubscriptionStats() {
   const { isAuthenticated } = useAuthSession();
 
-  return useQuery({
+  return useQuery<SubscriptionStats>({
     queryKey: queryKeys.subscriptions.stats(),
     queryFn: async () => {
-      const response = await apiClient.GET<typeof emptyStats>("/api/subscriptions/stats");
-      return getDataOrThrow<typeof emptyStats>(response, "Failed to load subscription statistics");
+      const response = await apiClient.GET<SubscriptionStats>("/api/subscriptions/stats");
+      if (!response.data) {
+        throw new Error("Subscription statistics response was empty");
+      }
+      return subscriptionStatsSchema.parse(response.data);
     },
     staleTime: 5 * 60 * 1000,
     gcTime: 10 * 60 * 1000,
diff --git a/apps/portal/src/features/subscriptions/services/sim-actions.service.ts b/apps/portal/src/features/subscriptions/services/sim-actions.service.ts
index c5f86564..43d7c0bf 100644
--- a/apps/portal/src/features/subscriptions/services/sim-actions.service.ts
+++ b/apps/portal/src/features/subscriptions/services/sim-actions.service.ts
@@ -1,4 +1,5 @@
-import { apiClient, getDataOrDefault } from "@/lib/api";
+import { apiClient } from "@/lib/api";
+import { simInfoSchema, type SimInfo } from "@customer-portal/domain/sim";
 import type { 
   SimTopUpRequest,
   SimPlanChangeRequest,
@@ -11,11 +12,6 @@ import type {
 // - SimPlanChangeRequest: newPlanCode, assignGlobalIp, scheduledAt (YYYYMMDD format)
 // - SimCancelRequest: scheduledAt (YYYYMMDD format)
 
-export interface SimInfo<T, E = unknown> {
-  details: T;
-  error?: E;
-}
-
 export const simActionsService = {
   async topUp(subscriptionId: string, request: SimTopUpRequest): Promise<void> {
     await apiClient.POST("/api/subscriptions/{subscriptionId}/sim/top-up", {
@@ -38,13 +34,15 @@ export const simActionsService = {
     });
   },
 
-  async getSimInfo<T, E = unknown>(subscriptionId: string): Promise<SimInfo<T, E> | null> {
-    const response = await apiClient.GET<SimInfo<T, E> | null>(
-      "/api/subscriptions/{subscriptionId}/sim/info",
-      {
-        params: { path: { subscriptionId } },
-      }
-    );
-    return getDataOrDefault<SimInfo<T, E> | null>(response, null);
+  async getSimInfo(subscriptionId: string): Promise<SimInfo | null> {
+    const response = await apiClient.GET<SimInfo>("/api/subscriptions/{subscriptionId}/sim", {
+      params: { path: { subscriptionId } },
+    });
+
+    if (!response.data) {
+      return null;
+    }
+
+    return simInfoSchema.parse(response.data);
   },
 };
diff --git a/apps/portal/src/features/subscriptions/views/SimCancel.tsx b/apps/portal/src/features/subscriptions/views/SimCancel.tsx
index 70e0e140..dd38f430 100644
--- a/apps/portal/src/features/subscriptions/views/SimCancel.tsx
+++ b/apps/portal/src/features/subscriptions/views/SimCancel.tsx
@@ -48,7 +48,7 @@ export function SimCancelContainer() {
   useEffect(() => {
     const fetchDetails = async () => {
       try {
-        const info = await simActionsService.getSimInfo<SimDetails, unknown>(subscriptionId);
+        const info = await simActionsService.getSimInfo(subscriptionId);
         setDetails(info?.details || null);
       } catch (e: unknown) {
         setError(e instanceof Error ? e.message : "Failed to load SIM details");
diff --git a/apps/portal/src/lib/constants/countries.ts b/apps/portal/src/lib/constants/countries.ts
new file mode 100644
index 00000000..af60b877
--- /dev/null
+++ b/apps/portal/src/lib/constants/countries.ts
@@ -0,0 +1,42 @@
+export interface CountryOption {
+  code: string;
+  name: string;
+}
+
+export const COUNTRY_OPTIONS: CountryOption[] = [
+  { code: "US", name: "United States" },
+  { code: "CA", name: "Canada" },
+  { code: "GB", name: "United Kingdom" },
+  { code: "AU", name: "Australia" },
+  { code: "DE", name: "Germany" },
+  { code: "FR", name: "France" },
+  { code: "IT", name: "Italy" },
+  { code: "ES", name: "Spain" },
+  { code: "NL", name: "Netherlands" },
+  { code: "SE", name: "Sweden" },
+  { code: "NO", name: "Norway" },
+  { code: "DK", name: "Denmark" },
+  { code: "FI", name: "Finland" },
+  { code: "CH", name: "Switzerland" },
+  { code: "AT", name: "Austria" },
+  { code: "BE", name: "Belgium" },
+  { code: "IE", name: "Ireland" },
+  { code: "PT", name: "Portugal" },
+  { code: "GR", name: "Greece" },
+  { code: "JP", name: "Japan" },
+];
+
+const COUNTRY_NAME_BY_CODE = new Map(COUNTRY_OPTIONS.map(option => [option.code, option.name]));
+const COUNTRY_CODE_BY_NAME = new Map(
+  COUNTRY_OPTIONS.map(option => [option.name.toLowerCase(), option.code])
+);
+
+export function getCountryName(code?: string | null): string | undefined {
+  if (!code) return undefined;
+  return COUNTRY_NAME_BY_CODE.get(code) ?? undefined;
+}
+
+export function getCountryCodeByName(name?: string | null): string | undefined {
+  if (!name) return undefined;
+  return COUNTRY_CODE_BY_NAME.get(name.toLowerCase()) ?? undefined;
+}
diff --git a/packages/domain/dashboard/contract.ts b/packages/domain/dashboard/contract.ts
index 0d4733c8..61816ae2 100644
--- a/packages/domain/dashboard/contract.ts
+++ b/packages/domain/dashboard/contract.ts
@@ -1,65 +1,22 @@
-/**
- * Dashboard Domain - Contract
- *
- * Shared types for dashboard summaries, activity feeds, and related data.
- */
+import { z } from "zod";
+import {
+  activityTypeSchema,
+  activitySchema,
+  dashboardStatsSchema,
+  nextInvoiceSchema,
+  dashboardSummarySchema,
+  dashboardErrorSchema,
+  activityFilterSchema,
+  activityFilterConfigSchema,
+  dashboardSummaryResponseSchema,
+} from "./schema";
 
-import type { IsoDateTimeString } from "../common/types";
-import type { Invoice } from "../billing/contract";
-
-export type ActivityType =
-  | "invoice_created"
-  | "invoice_paid"
-  | "service_activated"
-  | "case_created"
-  | "case_closed";
-
-export interface Activity {
-  id: string;
-  type: ActivityType;
-  title: string;
-  description?: string;
-  date: IsoDateTimeString;
-  relatedId?: number;
-  metadata?: Record<string, unknown>;
-}
-
-export interface DashboardStats {
-  activeSubscriptions: number;
-  unpaidInvoices: number;
-  openCases: number;
-  recentOrders?: number;
-  totalSpent?: number;
-  currency: string;
-}
-
-export interface NextInvoice {
-  id: number;
-  dueDate: IsoDateTimeString;
-  amount: number;
-  currency: string;
-}
-
-export interface DashboardSummary {
-  stats: DashboardStats;
-  nextInvoice: NextInvoice | null;
-  recentActivity: Activity[];
-}
-
-export interface DashboardError {
-  code: string;
-  message: string;
-  details?: Record<string, unknown>;
-}
-
-export type ActivityFilter = "all" | "billing" | "orders" | "support";
-
-export interface ActivityFilterConfig {
-  key: ActivityFilter;
-  label: string;
-  types?: ActivityType[];
-}
-
-export interface DashboardSummaryResponse extends DashboardSummary {
-  invoices?: Invoice[];
-}
+export type ActivityType = z.infer<typeof activityTypeSchema>;
+export type Activity = z.infer<typeof activitySchema>;
+export type DashboardStats = z.infer<typeof dashboardStatsSchema>;
+export type NextInvoice = z.infer<typeof nextInvoiceSchema>;
+export type DashboardSummary = z.infer<typeof dashboardSummarySchema>;
+export type DashboardError = z.infer<typeof dashboardErrorSchema>;
+export type ActivityFilter = z.infer<typeof activityFilterSchema>;
+export type ActivityFilterConfig = z.infer<typeof activityFilterConfigSchema>;
+export type DashboardSummaryResponse = z.infer<typeof dashboardSummaryResponseSchema>;
diff --git a/packages/domain/dashboard/index.ts b/packages/domain/dashboard/index.ts
index 46ed6e9a..7dcfba10 100644
--- a/packages/domain/dashboard/index.ts
+++ b/packages/domain/dashboard/index.ts
@@ -3,3 +3,4 @@
  */
 
 export * from "./contract";
+export * from "./schema";
diff --git a/packages/domain/dashboard/schema.ts b/packages/domain/dashboard/schema.ts
new file mode 100644
index 00000000..a8c94298
--- /dev/null
+++ b/packages/domain/dashboard/schema.ts
@@ -0,0 +1,60 @@
+import { z } from "zod";
+import { invoiceSchema } from "../billing/schema";
+
+export const activityTypeSchema = z.enum([
+  "invoice_created",
+  "invoice_paid",
+  "service_activated",
+  "case_created",
+  "case_closed",
+]);
+
+export const activitySchema = z.object({
+  id: z.string(),
+  type: activityTypeSchema,
+  title: z.string(),
+  description: z.string().optional(),
+  date: z.string(),
+  relatedId: z.number().optional(),
+  metadata: z.record(z.string(), z.unknown()).optional(),
+});
+
+export const dashboardStatsSchema = z.object({
+  activeSubscriptions: z.number().int().nonnegative(),
+  unpaidInvoices: z.number().int().nonnegative(),
+  openCases: z.number().int().nonnegative(),
+  recentOrders: z.number().int().nonnegative().optional(),
+  totalSpent: z.number().nonnegative().optional(),
+  currency: z.string(),
+});
+
+export const nextInvoiceSchema = z.object({
+  id: z.number().int().positive(),
+  dueDate: z.string(),
+  amount: z.number(),
+  currency: z.string(),
+});
+
+export const dashboardSummarySchema = z.object({
+  stats: dashboardStatsSchema,
+  nextInvoice: nextInvoiceSchema.nullable(),
+  recentActivity: z.array(activitySchema),
+});
+
+export const dashboardErrorSchema = z.object({
+  code: z.string(),
+  message: z.string(),
+  details: z.record(z.string(), z.unknown()).optional(),
+});
+
+export const activityFilterSchema = z.enum(["all", "billing", "orders", "support"]);
+
+export const activityFilterConfigSchema = z.object({
+  key: activityFilterSchema,
+  label: z.string(),
+  types: z.array(activityTypeSchema).optional(),
+});
+
+export const dashboardSummaryResponseSchema = dashboardSummarySchema.extend({
+  invoices: z.array(invoiceSchema).optional(),
+});
diff --git a/packages/domain/sim/index.ts b/packages/domain/sim/index.ts
index bf60a716..375bec19 100644
--- a/packages/domain/sim/index.ts
+++ b/packages/domain/sim/index.ts
@@ -24,6 +24,7 @@ export type {
   SimUsage,
   SimTopUpHistoryEntry,
   SimTopUpHistory,
+  SimInfo,
   // Request types
   SimTopUpRequest,
   SimPlanChangeRequest,
diff --git a/packages/domain/sim/schema.ts b/packages/domain/sim/schema.ts
index 9c36070c..5856ce34 100644
--- a/packages/domain/sim/schema.ts
+++ b/packages/domain/sim/schema.ts
@@ -60,6 +60,14 @@ export const simTopUpHistorySchema = z.object({
   history: z.array(simTopUpHistoryEntrySchema),
 });
 
+/**
+ * Combined SIM info payload (details + usage)
+ */
+export const simInfoSchema = z.object({
+  details: simDetailsSchema,
+  usage: simUsageSchema,
+});
+
 // ============================================================================
 // SIM Management Request Schemas
 // ============================================================================
@@ -283,6 +291,7 @@ export type RecentDayUsage = z.infer<typeof recentDayUsageSchema>;
 export type SimUsage = z.infer<typeof simUsageSchema>;
 export type SimTopUpHistoryEntry = z.infer<typeof simTopUpHistoryEntrySchema>;
 export type SimTopUpHistory = z.infer<typeof simTopUpHistorySchema>;
+export type SimInfo = z.infer<typeof simInfoSchema>;
 
 // Request types (derived from request schemas)
 export type SimTopUpRequest = z.infer<typeof simTopUpRequestSchema>;