how to use an at&t sim card in a tmobile blackberry?

Answer #1

You need to get it unlocked at your local phone store it costs about $25

Answer #2

You can also search for your cellphones unlock code and go to It will ask you for your phones IMEI number and walk you through the steps. But I think the charge like $15.

Answer #3

but it has been used before

Answer #4

If you unlock the T-Mobile Blackberry, You can not only use AT&T SIM but you can use any international GSM SIM to it. You can unlock your mobile using unlock code. You can get the unlocking code from at affordable cost.

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