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Arcadia310

macrumors regular
Original poster
Aug 16, 2010
190
0
I'm thinking about purchasing an unlocked iPhone 4 off craigslist. The guy I'm talking to right now said AT&T unlocked the iPhone. I've heard that if you apply a software update the unlock will be removed. I'm on T-Mobile so I need the phone to be unlocked otherwise it's worthless. Is this true? What are the easiest ways to maintain an unlocked iPhone but have it running on the newest version of iOS?
 
Updating the firmware on your iphone 4 will not reverse the unlocking actioned via the network.

It will however reverse jailbreaking.
 
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Your best hope is buying a used iphone that has been unlocked from the beginning by Apple, but from what I can tell, these are fairly rare in US?
 
Exactly.
The seller lied to you.
Maybe it's jb and unlocked using ultrasnow or a gevey sim.
Either way I would avoid that particular person selling it cause he's full of bs.
Yeah. If it was updated using those methods, will the unlock be erased when I update the software?
 
Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_2_10 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8E600 Safari/6533.18.5)

He may not be lying to you, he just may not be very knowledgeable actually, he may think it is a "AT&T unlocked iPhone" when it isn't in the sense AT&T didn't provide him with the unlock, but gevey, or ultra snow or something. Either way, be careful. I don't own a AT&T iPhone but I understand iOS 5 takes away the gevey option, thus, leaving no unlocking option unless it is factory unlocked.
 
Tell him to update to the latest firmware. Test it with you T-Mobile sim. Then you will know. :)
 
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