A800 lock
 

If your network locks your sim because its lost or stolen does this mean the phones locked because I cant use my fone after my network locked it and a new sim. I am o2. It just says searching but works with vodafone. It was originaly on Virgin.
Can anybody help me

Stolen phones IMEI numbers are blocked by network operators. Try to change IMEI on your phone and you will find out the reason.