Nokia 6682 / 6681

Someone at work is T-mo. I suppose I could try and use it long enough for testing puposes. I'm not in the office tomorrow.
My niece and and sister are still on old ATT, if they are 32k. But their phones are so old... I don't think they even have sims.
For that fact, I still have my old ATT sim.
I could accumulate col logs (just recycled my phone). But I would have to power off my phone to insert the ATT sim. Can't accumulate call logs usnig the ATT sim because it is
"dead". So, I don't know that that would work. Besides... are the call longs stored on the sim or phone memory ? Probably sim, huh, how they know your calls.