My question is. Is it possible for someone to use an old SIM card of mine?
Userlevel 7
+11
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.
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