diff --git a/apps/bff/src/integrations/freebit/services/freebit-operations.service.ts b/apps/bff/src/integrations/freebit/services/freebit-operations.service.ts
index fe6cb7b8..9b86114c 100644
--- a/apps/bff/src/integrations/freebit/services/freebit-operations.service.ts
+++ b/apps/bff/src/integrations/freebit/services/freebit-operations.service.ts
@@ -446,50 +446,18 @@ export class FreebitOperationsService {
       const hasVoiceFeatures = Object.values(voiceFeatures).some(value => typeof value === "boolean");
       const hasNetworkTypeChange = typeof features.networkType === "string";
 
-      // Execute in sequence with 30-minute delays as per Freebit API requirements
+      // Freebit API requires voice features and network type changes to be 30 minutes apart.
+      // This service handles single operations only - callers must coordinate sequencing via
+      // SimManagementQueueService for deferred network type changes after voice updates.
       if (hasVoiceFeatures && hasNetworkTypeChange) {
-        // Both voice features and network type change requested
-        this.logger.log(`Updating both voice features and network type with required 30-minute delay`, {
-          account,
-          hasVoiceFeatures,
-          hasNetworkTypeChange,
-        });
+        throw new BadRequestException(
+          "Cannot update voice features and network type simultaneously. " +
+            "Voice and network type changes must be 30 minutes apart per Freebit API requirements. " +
+            "Use SimManagementQueueService to schedule the network type change after voice updates."
+        );
+      }
 
-        // Step 1: Update voice features immediately (PA05-06)
-        await this.updateVoiceFeatures(account, voiceFeatures);
-        this.logger.log(`Voice features updated, scheduling network type change in 30 minutes`, {
-          account,
-          networkType: features.networkType,
-        });
-
-        // Step 2: Schedule network type change 30 minutes later (PA05-38)
-        // Note: This uses setTimeout which is not ideal for production
-        // Consider using a job queue like Bull or agenda for production
-        setTimeout(async () => {
-          try {
-            await this.updateNetworkType(account, features.networkType!);
-            this.logger.log(`Network type change completed after 30-minute delay`, {
-              account,
-              networkType: features.networkType,
-            });
-          } catch (error) {
-            this.logger.error(`Failed to update network type after 30-minute delay`, {
-              account,
-              networkType: features.networkType,
-              error: getErrorMessage(error),
-            });
-          }
-        }, 30 * 60 * 1000); // 30 minutes
-
-        this.logger.log(`Voice features updated immediately, network type scheduled for 30 minutes`, {
-          account,
-          voiceMailEnabled: features.voiceMailEnabled,
-          callWaitingEnabled: features.callWaitingEnabled,
-          internationalRoamingEnabled: features.internationalRoamingEnabled,
-          networkType: features.networkType,
-        });
-
-      } else if (hasVoiceFeatures) {
+      if (hasVoiceFeatures) {
         // Only voice features (PA05-06)
         await this.updateVoiceFeatures(account, voiceFeatures);
         this.logger.log(`Voice features updated successfully`, {