If I put my T-Mobile SIM card into an unlocked GSM phone, will I get T-Mobile apps. like T-zones?

My best guess is no. The T-mobile apps are loaded on the devices, like all applications, not associated with the service and the SIM card, which really carries only your phone number, and your contacts.

Justin explains it extremely nicely, whether for iphones to artwork even unlocked they desire rev 5 SIMS eg form is going 8944 xx5x and not 8944 xx1x (maximum 3G sims) because it wont be recognized via the telephone and that i doubt 3 might have rev 5 sims. additionally 3 have apualling coverage, call high quality and shopper service thats why they are much less high priced! better determination is to get an Orange or O2 PAYG SIM (then they're going to artwork with even locked iphones) and characteristic plenty better community and you gets the information factor determination besides. 3 is way less high priced yet no longer usable - I even have by no potential been waiting to call every physique who's on the three community as they keep chucking up the sponge!!