So you know that AT&T will be upgrading their "4G" network from HSPA+ to LTE, and you ask yourself: isn't that Verizon's 4G? My oh my, public, you've got a lot to learn about what 4G really is. AT&T aims to set you straight with a set of questions and answers, the questions asked by Sascha Segan over at PCMag and the answers come from the big blue globe itself. That's right, the entire company as a single brand answered questions this week, and here we're going to have a look at them. First up: what's the difference between 4G and 4G LTE?