We've been talking a lot about emerging mobile tech lately, tossing around crazy acronyms and words like WiMax, LTE, 3G,
G-Spot, EDGE and whatnot. A lot of you probably already know this stuff cold, but in case you don't, here's the quick and dirty guide to what you need to know.
GSM is the most widely used mobile standard—210 countries—and by AT&T and T-Mobile in the US. What's groovy about GSM is that any device that'll take a SIM card—"subscriber identity module" is a chip that identifies you to the network and allows you to get on—can get you on a local network. Hence the market for "unlocked" phones that aren't tied to any carrier, which you can just pop an AT&T or T-Mobile SIM card in. It's also AT&T's response to Verizon's open initiative: GSM networks are technically already open.