Use tmobile sim card for iphone?

Since t-mobile is carrying the iphone now, will it work if I put my sim card in an iphone I purchase from the Apple store?

Normally iPhones bought from the Apple Store are either
a) for a carrier specified when buying
b) unlocked

If any other carrier it would have to be unlocked (AT&T) or it wouldn't work at all (Sprint/Verizon)
If unlocked, then yes, fine.

  • Will cutting my sim card work to use as a micro sim card? I just ordered an iPhone 4 and I need to cut the sim card to make it a Micro sim. Will it affect it. I have seen a bunch of video and already have the template it for it. I'm using simple mobile. Do you know if anything wrong happen to it?
  • How to use my tmobile sim card with an unlocked at&t iphone 4? I have a tmobile sim card sense they are my carrier, but I have a at&t unlocked iphone 4 I was wondering if I could use this phone with my tmobile sim card. Also if I could us my tmobile sim card with a iphone 4s as well.
  • Changing from normal sim card to iPhone 4 sim card? I'm an AT&T customer with a smart phone. I'm wanting to buy an iPhone 4 but I know they take smaller sim cards than normal phones. If I buy an iPhone from an individual, can I take it to AT&T and have them give me a smaller sim card & transfer my information? Would I have to pay extra for it? Is it even possible?
  • Can you use still use the sim card from tmobile in this situation? I've been wanting an iPhone in my whole life, so i got an Alcatel One touch fierce, tmobile contract, uder my father's credit, so i have given a thought of buying an iPhone 5s in full price and ill be purchasing it on apple store. Is it possible if i use the sim card from tmobile and use the iphone as my phone? Is that possible?