I've read a whole lot of posts here about TDMA being old and how moving from
cheaper AT&T plans to more expensive Cingular plans is not the first choice
of many posters.

I'm still on a low-cost AT&T plan with an old Nokia 5165 TDMA phone.
Is there a SIM somewhere inside this phone that I can salvage to place in a
GSM phone so I can keep my AT&T plan?

OR

Is there anything I can do, any phone I can buy, any option I have for
keeping my AT&T plan with a new phone?

Thanks