Can i still use jailbroken iphone 4 that has been restored for at&t?

My friend had an iphone 4 for at&t that she had jailbroken however she couldnt unlock it for tmobile so she restored the phone to factory settings and when we restarted the phone it showed up like a brand new phone. If i put an at&t microsim in it will it work?

Yes. You could even rejailbreak it if you wanted to.

If it has been Factory Unlock then you could use it to any carrier.

  • Restoring an iPhone 3gs that has been jailbroken? I have recently bought a Blackberry however my old phone (iPhone 3GS) had been jailbroken so it was stuck on ios 3.1.2 and now I need to upgrade the software. I opened up itunes and tried to upgrade but it failed so I clicked restore and that failed as well. Now I have no access to my phone and the screen is a usb telling me to connect to itunes. I really need some advice. Is it possible to get my phone working again!
  • If an unlocked iPhone is jailbroken and restored, is it re locked? I'm gonna buy an iPhone from someone and he says he took it somewhere to get it unlocked. He said it's jailbroken, but if I want he can reset it. I don't want it jailbroken because I want to be able to update it. If he resets it, will it be relocked?
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  • Can you use an Iphone 5 from T-Mobile if it has been reported lost? My girlfriend works for a resterautn and sometimes patrons leave there phones there accidentaly. So they have a policy where if no one comes to claim it after 30 days that they keep them. Someone left an Iphone 5 (for t-mobile) and its been 29 days so tomorrow she gets to take it home if no one claims it. Will it be useable? What if they reported it lost? I know t-mobile has this no contract deal going on now so id like to hook that up! P.s.wow my spelling was horrible lol sorry!