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Unlocking Iphone 3 GS?

post #1 of 13
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Friend of mine is sending me an iphone 3gs. Ive been reading up on unlocking the ATT version/ with SIM and allow it to run on Verizon's network. I hear that people have successfully done this but i would like some confirmation on this and perhaps a good guide if someone knows of one.

Thanks
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post #2 of 13
While you could unlock a 3GS in the past. I'm not sure if it's possible to do it with current firmware.

Going from AT&T to Verizon is not possible. The two networks are different and require different internal hardware. One is GSM and the other is CDMA.
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post #3 of 13
Quote:
Originally Posted by axiumone View Post

While you could unlock a 3GS in the past. I'm not sure if it's possible to do it with current firmware.
Going from AT&T to Verizon is not possible. The two networks are different and require different internal hardware. One is GSM and the other is CDMA.

you can unlock the AT&T Iphone to work on t-mobile or any other sim based GSM carrier (straight talk, etc) but axiumone is correct, it will not work on Verizon.
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post #4 of 13
what the others said. On that note, if you're on Verizon in the US, you can't get ANY phone from another network to work on Verizon's network, because even the other CDMA phones have to have a clear ESN in Verizon's system for you to use the phone on their network. Same with Sprint. So for example, if you got an unlock code to carrier unlock a Sprint iPhone 4S (which has both CDMA and GSM compliant antennas), you could then use that phone on AT&T or T-Mobile, or another SIM carrier, but not on Verizon.
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post #5 of 13

If the Iphone 3 GS is out of contract, then you can have AT&T unlock it for you.  They have to do this now, where in the past they wouldn't.  As others have stated, it will still only be available for use on other GSM carriers, ie not Verizon.

post #6 of 13
You can unlock depending on what version and firmware is it on?
post #7 of 13
Quote:
Originally Posted by darkRyu View Post

You can unlock depending on what version and firmware is it on?

If the person who gives it to you is the original owner of the phone, they can have ATT unlock the phone the proper way.

If you have to unlock it by yourself, it's firmware and bootrom dependant. If it's running the latest firmware/bootrom, you are most likely out of luck.
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post #8 of 13
The firmware and bootrom are much less important currently with the 3GS, as there's a work-around for jailbroken iPhones, but the work-around will only work on iPhone 3GS's built before week 35 of 2011, as it'll fry the internal antenna if flashed onto a newer 3GS. I've been working on iPhones software and hardware for the last 3 years as a home business and keep up with this stuff, so if you have any questions feel free to ask.
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post #9 of 13
Quote:
Originally Posted by axiumone View Post

If the person who gives it to you is the original owner of the phone, they can have ATT unlock the phone the proper way.
If you have to unlock it by yourself, it's firmware and bootrom dependant. If it's running the latest firmware/bootrom, you are most likely out of luck.
Umm. But you forgot the part where only if the iphone with the contract expired can have it unlocked by ATT. And it is unlocked via itunes.
post #10 of 13
Quote:
Originally Posted by darkRyu View Post

Umm. But you forgot the part where only if the iphone with the contract expired can have it unlocked by ATT. And it is unlocked via itunes.

Is there anyone out there with a 3gs who has not completed their contract? Also, you missed a detail as well. If you upgraded your phone mid-2-year contract, the contract for the previous phone is considered completed. So in my opinion it was irrelevant info.
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