Does the Motorola RAZR2 from Tmobile work with AT&T with no malfunctions?

Does the Motorola RAZR2 from Tmobile work with AT&T with no malfunctions whatsoever. All I have to do is put in the AT&T sim card in the slot and it'll work perfectly fine. Right?

Both are GSM networks so no problem.

You need to unlock your device from T-Mobile network restriction. Only then you can use it with an AT&T SIM card. You can unlock your Motorola Razr safer and easier using unique unlock code. You can get the unique unlock code for a Motorola Razr from ProUnlocking.com at affordable cost with an easy unlocking guide. Good luck.