diff --git a/src/com/android/phone/PhoneInterfaceManager.java b/src/com/android/phone/PhoneInterfaceManager.java
index d6eb4aa..de51497 100644
--- a/src/com/android/phone/PhoneInterfaceManager.java
+++ b/src/com/android/phone/PhoneInterfaceManager.java
@@ -10194,8 +10194,9 @@
             throw new IllegalArgumentException("Invalid Subscription ID: " + subId);
         }
         if (!isImsAvailableOnDevice()) {
-            throw new ServiceSpecificException(ImsException.CODE_ERROR_UNSUPPORTED_OPERATION,
-                    "IMS not available on device.");
+            // ProvisioningManager can not handle ServiceSpecificException.
+            // Throw the IllegalStateException and annotate ProvisioningManager.
+            throw new IllegalStateException("IMS not available on device.");
         }
 
         final long identity = Binder.clearCallingIdentity();
@@ -10794,8 +10795,9 @@
             throw new IllegalArgumentException("Invalid Subscription ID: " + subId);
         }
         if (!isImsAvailableOnDevice()) {
-            throw new ServiceSpecificException(ImsException.CODE_ERROR_UNSUPPORTED_OPERATION,
-                    "IMS not available on device.");
+            // operation failed silently
+            Rlog.w(LOG_TAG, "IMS not available on device.");
+            return;
         }
 
         final long identity = Binder.clearCallingIdentity();
@@ -10819,8 +10821,9 @@
             throw new IllegalArgumentException("Invalid Subscription ID: " + subId);
         }
         if (!isImsAvailableOnDevice()) {
-            throw new ServiceSpecificException(ImsException.CODE_ERROR_UNSUPPORTED_OPERATION,
-                    "IMS not available on device.");
+            // ProvisioningManager can not handle ServiceSpecificException.
+            // Throw the IllegalStateException and annotate ProvisioningManager.
+            throw new IllegalStateException("IMS not available on device.");
         }
 
         final long identity = Binder.clearCallingIdentity();