I bought a 4S 5.1 with good ESN. But, I am not in the USA. I was thinking of giving them a call over skype and see if they could unlock it, but I'm not actually on their plan. Would I be better off getting a Gevey Ultra S? If so, would I need a CDMA one or GSM one? Since it's a Verizon iPhone. The CDMA gevey on applenberry doesn't say it supports 5.1 though. Also, the carrier in my country will be GSM.