see i thought that,
so i rang up O2 and they told me they wontbe able to do a thing
they say its completely locked , even if another sim or whatnot is done to it they cant access nothing
i just wanted to ask on here too
They can still access everything on the phone, including photos and apps. The only thing they can't do is make voice calls or data calls using your account. In fact, I think they can still register it to another account.