The Atrix2 only supports ATT HSPA bands so unlocking it and using it on tmobile means you will only get EDGE speeds.
I have a LOCKED Atrix2 that I have used on AirVoice (an ATT MVNO like ST). It works fine and I have had no problems with it. You do not have to unlock an ATT phone when you are using an ATT MVNO.
Getting a ATT compatible sim from ST will allow you to use your Atrix2 at full HSPA speeds and not worry about having it unlocked.
The Atrix2 always shows HSPA even if you are in an HSPA+ area.



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