iPhone 5 can only connect to certain LTE networks in the US, Canada, Japan, Germany, UK, Australia, Korea, Hong Kong, and Singapore.
To support the latest LTE technology, Apple has pioneered a unique single-radio LTE solution that provides blazing fast speeds while fitting perfectly into the new remarkably thin design. iPhone 5 features dual-band 802.11n Wi-Fi support for a wireless experience up to 150 Mbps.
The device supports the following LTE frequency bands.
LTE 700 MHz Class 17 / 1700 / 2100 GSM A1428
LTE 850 / 1800 / 2100 GSM A1429
LTE 700 / 850 / 1800 / 1900 / 2100 - CDMA A1429
Also Read: No iPhone 5 for India and China for now