Can I still use my cingular phone, now that AT&T bought them out ?

I have a cingular moto razor cell phone and I am getting AT&T can I still use it ?

Hi no you can't use AT&T sim in Motorola razor until you unlock it from cingular network ...You can easily unlock your phone using sites like Unlocking4U.com they are providing unlock code for all mobile models at reliable cost .After unlocking your phone you can freely use it with any GSM sim .....