AT&T is currently the only carrier to offer 4G LTE roaming in other countries, a change it rolled out back in December. At the time, only Canada was supported, followed by the UK. Now the carrier is rolling out the service in around a dozen additional countries. These range from locales as small as Hong Kong and Singapore to places as expansive as Australia and Russia.
AT&T now also supports 4G LTE roaming in:
- Antigua & Barbuda
- Hong Kong
- South Korea
Since carriers in different countries use various wireless frequencies, a device that works in one country may not work in another.