I keep getting an error message when I try to purchase a SIM. I've tried 3 different cards, one of which was registered to someone else at a different address, and I've checked to make sure the address on my billing statement matches what I entered in the form (which is what the tech person says is usually the issue). Nothing wrong with my credit card, as I've called the 3 companies and they all say from their end they approved the charge. GoMobile won't take orders over the phone. Anyone out there having the same problem?