you have to go online to buy a unlock code for the phone, once you have the unlock code you can put the sim card in and it will ask you for the code. if not you can buy a sim card holder that can...
They say that you can't but we have done it with several go phones and it has worked just fine. I keep one with a charged battery (taken out of the phone when not in use) in my glove box. If I am...