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Can you use a T-mobile cell phone with a AT&T sim card?
I'm thinking about buying a blackberry phone on eBay and its going for a good price but it is for T-mobile and I have at&t service. Can I use my at&t sim card in the T-mobile phone or do you have to do something special like "un-locking" the phone? If so, how do you un-lock cell phones?
Thanks so much!
Its its "locked" to T-Mobile, then your AT&T SIM wont work :/
your phone would in fact, have to be "unlocked", which means that it can be used with T-Mobile OR AT&T (in the US), and other GSM carriers overseas when you travel.
just be careful, and obviously read what you are buying.
unlocking phones yourself can be tricky, usually there is a software code that you might be able to get from AT&T, or search google.
good luck!
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