I have the IMEI code for my AT&T cell phone plus the unlock code BUT I have no ides how to enter these codes to unlock the phone. for instance do I enter the 17 digit code just like I am making a call then enter the 8 digit code to unlock the phone. If this is the correct procedure do I do this when I get to Santa Domingo and then purchase a new SIM card for the DR. Or do I wate until I get there and let the sales person do all the programing. Also which SIM card do I buy to use in DR. Any help will be greatly appreciated.