Forum Discussion
Sim card
My question is. Is it possible for someone to use an old SIM card of mine?
Not in the way you are probably thinking. Once you activate a new SIM, the old SIM is detached from your account. For a time it may be possible to reactivate the old SIM on a different line but the time is limited. The SIM’s ID will soon be removed from T-Mobile’s database and will stop functioning altogether.
