You can . on September 14. The phone will be available beginning September 21 in the U.S. Doors at Apple Stores will open at 8 a.m. local time on that day. In addition to this country, the new iPhone also goes on sale in Canada, UK, France, Germany, Australia, Japan, Hong Kong, and Singapore on September 21.

Apple says that the iPhone 5 will be available in 20 more countries starting September 28, and in 100 countries by year's end.

We're going to assume you're asking that question from within the borders of the U.S. (And if not and you're wondering which telecoms offer LTE outside the U.S. see .) If that's the case, then AT&T, Sprint, and Verizon are your wireless service providers for nationwide coverage, just like they were when the iPhone 4S debuted. Note that the Big Three are going to want you to sign a two-year service agreement. Assuming you're not obligated to stick with your existing carrier, you should check the coverage maps for , , and --particularly for LTE coverage--to get a sense of which carrier best serves your needs before you commit to them for the next two years.