the problem with an unlooke mobile phone is: the sim-card you want to use doesn't fit is there any possibility of manupilating the sim card instead unlocking the mobile phone? so maybe you simulate the phone the original sim-card? don't know, so what information on the sim-card is relevant for this? is it the phone-number? is there software for something like this? i have an card reader and writer, may this could work?!
All SIM cards are the same size. There are crooks that I'm told who clone sims. The Sim contains the identifying information of the account, the Network the account is on etc. It can also be made to store your contacts etc. J