What Cell Phones Can Work With Cingular?

I don’t know much about this so I need help. If my friend wants to cell me his T-Mobile cell phone, can it work with Cingular if I unlock it at some kind of phone repair shop?
Verizon wouldn’t work because they use CDMA, right? But what other companies’ phones can work with Cingular? And how much does it cost to unlock a phone?

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