Advice on removing unlock oniPhone 3g

[Ipod-Junkie]

Hi,

I have an iPhone 3g which originally came with an O2sim, I jailbroke the 3g (OS 3.1.3) and used ultrasn0w to unlock the iphone so I could use a Virgin Mobile sim (UK). All is working fine however I want to upgrade the OS to 4.1 (app related) and possibly use another O2 sim I have that I have for a Blackberry contract (nolonger needed).

So I want to know;

1. Will all O2 sims work in the phone i.e. if I were to update the OS to 4.1, I know I can't unlock the phone but will it work with the Blackberry O2 contract sim?

2. If I were to deinstall Ultrasn0w unlock whilst on 3.1.3 to test the O2 sim, would there be any problems reapplying ultras0w if it doesn't work?


Cheers

Paul.

[RiotNrrrd]

You could go to 4.0.1 via iTunes, get the baseband updated to 5.13.04 and then use PwnageTool to go to 4.1, preserving the baseband and remaining unlockable. I did that to my old 3G before I sold it to a friend.

[Ipod-Junkie]

RiotNrrrd,

Thanks for the reply but I don't have access to a MAC and I thought PwangeTool was for MAC only. I assume there is no windows version?

[RiotNrrrd]

Yes it's Mac-only (not MAC - MAC == Media Access Control).

I could swear there is a Windows-equivalent tool that allows you to similarly upgrade using a custom IPSW that preserves the baseband, though.

[Northernmonkey]

Doesn't sn0wbreeze?

You'd have to get a trusted IPSW though.

[Ipod-Junkie]

Going back to my first question is there any reason why unistalling ultrasn0w and then reinstalling it back on the same OS wouldn't work? This way I could test the other sim and if it worked just upgrade to 4.1 and jailbreak it again with no future need for an unlock.

Is it worth a try?