iPhone 3GS - Version 3.1.3

[Jayke]

I am wanting to change from factory O2 to T-Mobile, can anybody point me to a decent tutorial that actually works, thanks.

Edited by HotelUser (Trialist Forum Moderator): Thread moved from "Technology Discussion" as I feel it is more suited here.

[Luke]

Erm.. they don't have firmware carrier specific - it's either locked or not. There's no tutorials.
You can get it unlocked from O2 OR jailbreak it and unlock it from there.

[Jayke]

Just used jailbrake.me, installed cydia and then used ultrasnow to unlock. Took 5 minutes and worked like a charm, thanks guys.

[Casanova]

Also, if you call your network they'll unlock any handset for a £30* charge. Although, iPhones you can always jailbreak. If you have any issues keep in mind to 'restore' your device as otherwise it's warranty is broken with the jailbreak.

*depends on network.

[StefanWolves]

Just used jailbrake.me, installed cydia and then used ultrasnow to unlock. Took 5 minutes and worked like a charm, thanks guys.

You may swell update to 4.0.1... And then jailbreakme.com and then unlock. Much better firmware.