I'm doing research for a family member looking to get her first iPhone She's interested in Straight Talk. Walmart sells the iPhone with Straight Talk how does this work? Would it be better to buy an iPhone unlocked elsewhere and then get a sim from Straight Talk. How do I know if she would be getting a 3G 4G or LTE network? I called Straight Talk and they can't quote me what network she'd get. Also, what are the rates they charge each month?