iphone at&t to t-mobile?

[Jessica]

how can i use my t-mobile sims free on iphone for

 

[brian]

You would have to jailbreak then unlock the iphone.

 

[geeth]

Hi just by unlocking your iphone from AT&T network you can use your T-mobile sim in it .To unlock it visit Unlocking4u.com here they help you unlock your iphone using remote unlocking method .