iPhone Can I use my AT&T iPhone 4 on O2

[jturn]

Hi,

I've done some searches and found some very old posts about using an iPhone 4 on O2, but can't find anything recent. I'm going on a trip to the UK and would like to be able to use my iPhone 4, mainly for calls, texts, and surfing, but also occasionally for GPS if possible. I have an O2 sim card- is there a way for me to unlock the phone to use the card?

I'm currently running OS 6.1.3 and Firmware 04.12.05

Any help or suggestions would be greatly appreciated!

 

[TriJetHero]

No need ask AT&T to unlock or an IMEI unlock online, there is a big thread on here use search.

 

[jturn]

Thanks! Getting it sorted out with AT&T now.