answer:I don’t know if this is any different on iOS, and it depends on your carrier. But make sure you know how to remotely disable your phone if it is lost/stolen. When it happened to me, AT&T said “gee, we could help you if you were paying the extra monthly convenience (AKA extortion) fee, but otherwise we just cannot prevent someone from using that phone. Unpossible! You better buy a new phone from AT&T!” At least in Android, changing my Google password locked other users out of Gmail, Google Voice, Calendar, Contacts, etc. Which is handy if you lose your phone. But I could not get the phone turned off. That was an AT&T problem, not an Android problem. In the end some guy found and returned my phone and refused the $50 reward, nice! PC Magazine, How to Remotely Disable Your Lost or Stolen Phone