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you can't use AT&T sim in Blackberry phone locked with t-mobile network .To fix this you have to unlock your phone from t-mobile network..You can easily unlock your blackberry curve from network lock using sites like Classicunlocking.com here they render unlock code for all mobile models at reliable cost ....
How to use an at&t SIM card on a Tmobile Blackberry curve? what are the steps to get it to work fine
How to use an at&t SIM card on a Tmobile Blackberry curve?
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