Question: When a SIM/USIM returns a "Technical problem with no diagnostic given" code in response to an ENVELOPE (SMS-PP DOWNLOAD) message, what action should the UE take regarding user notification?
Option 1: Provide a clear indication to the user through a dedicated lamp, text-string, or other unambiguous means via the MMI.
Option 2: No indication shall be given to the user since this code is not related to a direct user action in this context.
Option 3: Automatically restart the UE to attempt resolving the technical issue before considering notification.
Option 4: Always prompt the user to verify their CHV (Card Holder Verification) credentials.
Explanation: According to the specified behavior for certain return codes in response to specific messages like ENVELOPE (SMS-PP DOWNLOAD), if a "Technical problem with no diagnostic given" code is received, it is not related to a user's direct action in this context. Hence, no user notification is required, leaving the handling of other cases to manufacturer discretion but mandating silence on these specific, non-user-action-related instances.