I jailbroke a friends iphone he gave me so i could use it on my sim, and everything is fine except i can only ever pick up Edge network, wherever i go.
I live in central London and this should not be an issue.

I am running firmware 3.1.2, on 05.11.07 and my carrier is 02.

I jailbroke my iphone with Jailbreakme, and unlocked it with Ultrasn0w.

any ideas why this might occur? I have grazed google but cannot really find anything similar.

Please help!