Yes. Apple has 2 models - one GSM and one GSM/CDMA. Buying the TMobile version just means you got the GSM variant with a TMobile SIM card. TMobile version doesn't require you to have a TMobile account to purchase so it is the scalper's version as well.
Thanks, bought it with intent to keep, but my tmobile order will get here the same day. My buddy with ATT wants to buy it from me and I wanted to make sure that it doesn't have to be active on tmobile for 30 days before unlock.