Hi For the last two years, I have been buying the tmobile iphones (full price) from the apple site. The phones are unlocked and they work with sim cards from India. I think they use GSM? I read that if I pay full price for the verizon, it will be unlocked and it will work with the GSM networks? Is this true? So, does this mean I can buy either tmobile or verizon? I am in the US. Thanks in advance!