If i update my Tmobile iPhone?

If my iPhone software is 5.1.1 if I update it to 6 will my tmobile sim still work on it

I don't see why it wouldn't work. I up dated mine and it works just fine but I do have AT&T. I think you will be A-okay. Just back it up on icloud first if you are worried about it.

No such thing as a tmobile iphone.
if you mean a unlocked att iphone that works on tmobile, it will not lock if its a factory unlocked iphone.

  • Verizon iphone 4s unlocked to tmobile update to ios7? I have an iphone that is from verizon and i got it unlocked to work for tmobile. I want to update it to latest ios 7. Can i update it without the unlock going away? If i can will my phone keep working after?
  • Update stopped during ios update own iphone now phones broke I connected my iPhone 4 to my computer (iTunes) and started doing the update through iTunes. About five minutes into the update iTunes in my computer stops working, causing the update to of course stop working. Now my phone will not turn on. On the screen it is black with the 'charge symbol' as if it were low on battery and an iTunes symbol. I have tried turning my phone off and on, but of course it didn't respond.
  • New iOS 6 update, find my iPhone update? I don't like the new find my iPhone update is there a way to change back to the old find my iPhone but keep the new update? It's not showing locations like it used to and won't even how me major boroughs like Croydon. Streets are difficult to see, much smaller picture. General *** compared to the older version.
  • Is the tmobile iPhone 5 already unlock? And will the tmobile 5 work on AT&T? I have recently been looking at buying an iPhone 5 and I found someone, but they have tmobile an I have AT&T. Will it work on AT&T? Also, how much would the newer SIM card be?