Check whether the sub still available when handling the request am: d883d46f81 am: 3db50b9e1c am: 5c82d6d828

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telephony/+/15974128

Change-Id: I37fc8eedbce15a74443e4d7047ddac1fff2d5cc0