diff --git a/lib/features/chat/services/text_to_speech_service.dart b/lib/features/chat/services/text_to_speech_service.dart
index 6225e55..831befc 100644
--- a/lib/features/chat/services/text_to_speech_service.dart
+++ b/lib/features/chat/services/text_to_speech_service.dart
@@ -88,7 +88,11 @@ class TextToSpeechService {
     _deviceEngineAvailable = false;
     try {
       await _ensureAndroidDefaultEngine();
-      await _tts.awaitSpeakCompletion(false);
+      // Ensure speak() futures complete only after playback finishes.
+      // This avoids race conditions where completion callbacks fire
+      // early in release builds (especially on iOS), which can cause
+      // our voice-call pipeline to resume listening and cut off speech.
+      await _tts.awaitSpeakCompletion(true);
       await _tts.setVolume(volume);
       await _tts.setSpeechRate(speechRate);
       await _tts.setPitch(pitch);
diff --git a/lib/features/chat/services/voice_input_service.dart b/lib/features/chat/services/voice_input_service.dart
index 892f4e5..40f1452 100644
--- a/lib/features/chat/services/voice_input_service.dart
+++ b/lib/features/chat/services/voice_input_service.dart
@@ -523,9 +523,18 @@ class VoiceInputService {
   /// Ensures initialization and microphone permission before starting.
   Future<Stream<String>> beginListening() async {
     await initialize();
-    final hasMic = await checkPermissions();
-    if (!hasMic) {
-      throw Exception('Microphone permission not granted');
+    // For on-device STT we preflight the microphone permission so we can
+    // fail fast with a clear error before starting any recognition.
+    //
+    // For server-only STT we skip the preflight check and let the VAD /
+    // recording pipeline request or validate permissions as needed. This
+    // avoids false negatives from the lightweight probe and prevents
+    // blocking server STT when the platform would otherwise allow it.
+    if (!prefersServerOnly) {
+      final hasMic = await checkPermissions();
+      if (!hasMic) {
+        throw Exception('Microphone permission not granted');
+      }
     }
     return await startListening();
   }