Apple Details iPhone 5 LTE Carrier Compatibility
The North America-focused GSM model is compatible with LTE service on AT&T in the United States and Bell, Rogers and Telus in Canada. The CDMA model is compatible with LTE on Sprint and Verizon in the United States, as well as KDDI in Japan.
For the international-focused GSM model, LTE is supported on ten different networks in Germany, the UK, Australia, Japan, Korea, Hong Kong, and Singapore.
This information is for the first round of launches taking place on September 21, and Apple will presumably be updating this page with additional entries for later markets that are also rolling out LTE on frequencies compatible with these devices.