Would Jailbreaking an Unlocked iPhone 4 Lock it?

[Ronnitude]

Hi,

I recently purchased an unlocked iPhone 4 (from Canada) as a gift for my little sister who lives in Africa. Before I send it to her, she requested that I jailbreak it, my question is would jailbreaking this phone lock it somehow? I guess what i'm trying to understand is the difference between the factory's unlock and the Dev. team's ultrasn0w unlock?

Thanks.

[Simon]

No, jailbreaking it will not affect your unlock.

[Ronnitude]

Excellent! So just curious, how does apple lock a phone anyway? Is it an encryption type of deal?

Thanks for your help Simon (Y)

[Simon]

Basically they are all locked. But Apple has a server with all IMEI's of iPhones that are factory unlocked. When activating iTunes checks this and if it sees your IMEI in the unlock server then it unlocks your iPhone. Once a iPhone is officially/factory unlocked it will always be unlocked.

[Ronnitude]

Interesting! Well thanks

[Simon]

no prob

[iamkeishasarah]

Basically they are all locked. But Apple has a server with all IMEI's of iPhones that are factory unlocked. When activating iTunes checks this and if it sees your IMEI in the unlock server then it unlocks your iPhone. Once a iPhone is officially/factory unlocked it will always be unlocked.

What about phones that are unlocked by Gevey? Will jailbreaking affect it? My phone is locked to AT&T and i used gevey to unlock it. Works fine ü Now Im planning to jailbreak it but I fear it will lock my phone back.

[xtacy]

Be relaxed and jb it Jailbreak DOESNOT break any unlock including gevey.

[i.Annie]

Except if you jailbreak before applying the Gevey for the first time. If any restore/upgrade is done, ensure that it is done through stock fw, apply the Gevey, then jailbreak after unlock is in place.

[xtacy]

^ what?!?

[i.Annie]

GEVEY Utra FAQ

"Can the GEVEY Ultra unlock iPhone 4 with custom firmware installed?
If your iPhone 4 has custom firmware installed, the GEVEY Sim adapter will not work. You must restore your iPhone 4 to the original firmware to unlock your iPhone 4."

It doesn't specify any failure if you restore to stock fw, jb with for example redsn0w, then try to use the Gevey for the first time but I'm assuming it would apply the same way as the above statement. It needs a clean stock fw.

[xtacy]

Only for cfw it won't work.
I have used gevey on jailbroken devices. They work fine ..
The exploit is independent of device being jailbroken or not
Edit : btw gevey does work on iOS5 betas with preserved bb so indirectly or directly it seems to work on cfw too

[i.Annie]

So you've actually tried a Gevey SIM on a device for the first time whilst the device was already jailbroken?

If so then that clears a few things up. Although I don't really see a difference in a device having a cFW which means it is jailbroken not being able to process the Gevey adapter and a device that already has been jailbroken first. It would make sense for it to work if the device was stock, apply Gevey, then jailbreak after. It can be a jailbroken device using a Gevey SIM, I just think the order in doing it matters.

[xtacy]

I used gevey on my old iPhone which was locked to att for about 2-3 weeks and yeah it was jailbroken the first time I used it..

[Simon]

I think what the gevey makers are getting at is that it should not be hactivated. Although I have seen a gevey work on a hactivated iPhone 4 so not really sure.

[i.Annie]

It's quite confusing.