At&T and T-Mobile sim cards?

Yes, but only if the cell phone has been unlocked. You can go on e-bay and for a couple of bucks get an unlock code for the cell phone that will allow it to take any Sim card and use it. I have an AT&T LG Incite that is unlocked and using a T-mobile Sim card myself

only if its unlocked

Caduy said:

Does a T-Mobile sim card work in an AT&T cell phone?
I have T-Mobile service but I bought a Samsung A737 will it still work?

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HI you can't use t-mobile sim card in the samsung A737 mobile until you unlock it from AT&T network lock ...You can easily unlock it using sites like WickedUnlock.com here they are providing unlock code for all mobile models at reliable cost ......After unlocking the phone you can freely use it with any GSM sim ....