Okay, I need some education here. I'm looking at ditching my current Verizon plans with unlimited data and going to Straight Talk prepaid plans for my three smartphones. It is my understanding that Straight Talk uses AT&T as well as T-Mobile for their network. My plan is to buy "international" versions of whatever phones I want (aside from a GNex for myself). So what should I be looking for in terms of radio frequencies if I want the phones to run "4G"? Should all international phones do that on the GSM networks? There are just so many options out there, it's easy to get overwhelmed. Thanks in advance for any help!