Hi there @Anonymous . There's an option in your MyO2 account, accessible through the O2 website, to get your phone unlocked. You'll need to have at least £15 of credit though, as this is the cost to get a handset unlocked on PAYG. Once you've submitted the request, the handset should be unlocked within 24 hours. The unlocking process will fully complete whenever you insert a SIM card from another network.
You can find out more here
http://www.o2.co.uk/help/phones-sims-and-devices/unlocking-your-iphone-and-using-it-on-another-networkHope this helps
