I've been looking to get my girlfriend a new phone for christmas. Specifically the z610i. However, she's on o2 payg and the phone doesn't seem to be available with them. I've seen the phone listed as sim free for up to £250 or available on payg with other networks (Orange do it for £180). Soooooooooooooo..... If I were to buy it on another network, would it be possible to get it unlocked to use her o2 payg sim? How would I go about this, and how much would it cost? Ta MO :)