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Perhaps I'm misunderstanding, but long before T-Mobile did away with their contracts, I was SIM swapping between Android devices (and even flip phones) with no

Perhaps I'm misunderstanding, but long before T-Mobile did away with their contracts, I was SIM swapping between Android devices (and even flip phones) with no problems. I still do this occasionally since I keep hoarding my old phones as development devices, and even with phones T-Mobile doesn't actually support (i.e. you can't select it as your current device if you use their web portal), I have not had problems. Perhaps this is different between providers?

vvhn 13y ago
>Perhaps this is different between providers? On the CDMA side (i.e. Verizon, Sprint), yes. On the GSM side (T-mobile and AT&T), if your phone is locked to a carrier it will still accept any SIM from that carrier and your carrier provided SIM will work on any GSM unlocked phone with compatible frequencies.