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This is one of the nice things about GSM (as opposed to CDMA, which Verizon/Sprint use). GSM carriers can't block you from transferring SIM cards from one phone
by chimeracoder 13y ago
This is one of the nice things about GSM (as opposed to CDMA, which Verizon/Sprint use). GSM carriers can't block you from transferring SIM cards from one phone to another.
It's for this reason that people had iPhones on T-Mobile long before the iPhone was officially available on T-Mobile.
- gergles 13y agoWell, they could stop you if they really wanted; they could IMEI sniff. AT&T does it to detect "smartphones" so they can helpfully add 'mandatory services' to your plan without your consent - it'd be easy for T-Mobile to block Apple's IMEI ranges from registering on the network regardless of whether your SIM worked or not. The FCC should have implemented some actual common carrier regulations/a Carterfone-equivalent for the mobile industry. Instead, they're so mired in regulatory capture we get nothing.