There's a few shops round my way that unlock blocked SIM cards for mobile phones. Just wondering how it's done? Not sure if you have Pay As You Go phones in the States...If you have a SIM card that's say in a phone that's on a contact phone you wouldn't be able to use it on a PAYG phone. Just wondering if it's possible to change that so you can use that SIM on any phone..Or is that the same as unlocking the card??