if i by a at&t unlocked phone and put my tmobile prepaid sim in it will it work?

[Michelle]

i wanna by an unlocked phone from another carrier. the Sim card i currently have is a prepaid. if i put it in the other phone will it still be prepaid.

[vicecaptain]

If the iPhone was unlocked in a safe method, You can definitely use a Tmobile SIM in an AT&T unlocked iPhone. If the iPhone was unlocked using any unsafe methods or flashing, There are chances for other network SIM cards not working properly. So, Ensure with the seller about unlock method before buying the iPhone. Or you can buy an AT&T network locked iPhone for low cost and unlock it yourself safer.
The safest and easiest way to unlock an iPhone is to unlock using remote unlocking service. You can get the remote unlocking service for an iPhone from Theunlockspot.com at affordable cost with easy unlocking guide. This is a permanent unlocking method and doesn't require a jailbreak too. Good luck mate.