Great news, O2 unlock your iPhone 4, so long waiting for this.
If you want unlock it follow here: https://forums.imore.com/e?link=htt...2Fupdate%2Funlockmyiphone.html&token=4X7F-wWN
If you want unlock it follow here: https://forums.imore.com/e?link=htt...2Fupdate%2Funlockmyiphone.html&token=4X7F-wWN