Is it possible to keep my phone number if I happen to switch to an iPhone?
Your phone number is attached to your SIM card not your phone. If they are the same SIM all you have to do is put your SIM in the new phone and bingo. If it's a different size SIM then all you have to do assign a new SIM to your number.
Retrieving data ...
Manage your T-Mobile account
Use the T-Mobile App or your My T-Mobile account
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