iPhone 3GS was unlocked, now restored and don't work

[Rreila]

Hello

So I have an iPhone 3GS that was unlocked and I used tmobile sim card. My phone had some issues, and so I restored the phone using iTunes back to original factory. Now I can't get pass the setup part and unable to use my phone. I have AT&T now. How to fix this?*

Any help would be appreciated thank you!

 

[aziatiklover]

U got to be specific cuz what kinda unlocked did u have? Factory unlocked? Ultrasnow unlocked? Ipad baseband unlocked? Ect.....

 

[Rreila]

Uh that I don't know... It was unlocked by my friends dad...

 

[dhlizard]

Uh that I don't know... It was unlocked by my friends dad...

We cannot guess, sorry.

 

[Applejuiced]

It was jb and software unlocked most likely.
You never supposed to restore to official firmware.
You will always lose the unlock.

 

[TriJetHero]

Sounds like you are stuck on the activation screen, just jailbreak the phone with redsn0w.

During the jailbreak you can check activated and it should bypass the activation screen.

From there you can check what firmware/Baseband you have and take it from there