Mine was registered as am on £20 per month..i've heard of them not blocking unregistered payg, but that was a while ago.
That will take about 10 minutes then.
I didn't think it was possible to unlock phones which had been blocked due to them being lost/stolen, as the network blacklist the IMEI on the phone.
Liam
They can change the IMEI.....illegal I believe but still doable