The Note II doesn't have the correct frequencies for TMobile.
The S3 should already be unlocked.You will probably only get EDGE though and not 3G.
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The statement above is not exactly true, I put in a tmobile sim card and was able to make calls and send txt. Just not data.
But if I can change the APN settings the data would work. Just need the unlock code so I can add an APN for Tmobile.