I recently ordered a Pay Monthly SIM from 3 because to put it bluntly tesco mobile sucks. I got the new SIM today but when I put it into my phone it said the phone was locked onto the tesco SIM. I did look on the tesco customer support site but it said they'd charge me like £20 to get it unlocked. There's a place in the town that unlocks phones but they won't be open until Tuesday (Sunday today, bank holiday tomorrow). Any way that I can do it myself? It wouldn't be such a problem except the SIM is being paid for and well it isn't being used, which is rather frustrating 