How Do I Unlock Cingular 8525?

I have a 8525 and no cingular simcard i only have tmobile simcard, would i still know how to unlock it without having it in service beside cingular or could i unlock while my tmobile simcard is in it??

Well you need a unlock code for this simcard so that you can change the cingular phone to use it near other networks. There is a special four digit code that work with cingular mobile and can be easily unlocked.

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