AT&T is our roaming carrier in the United States and they use 4G/5G networks. 2G/3G is no longer supported. To make and receive voice calls while roaming in the USA, you’ll need to have:
- a VoLTE capable device
- VoLTE enabled in your phone settings
- Data Roaming turned on
- A device that supports AT&T’s 4G/5G frequencies.
VoLTE stands for Voice over Long Term Evolution and it allows you to make high-definition (HD) calls over a 4G network. Simply put, when you make a voice call using VoLTE, you connect quicker and enjoy a clearer connection with reduced background noise.
IMPORTANT: By having these settings enabled, you will likely incur daily roaming charges because VoLTE requires data use. If you want to avoid all roaming charges, keep your device in flight mode while you’re away. This means you will not be able to use data, calls or SMS. However, you can use a local WiFi connection while in flight mode to access data and make the most of free WiFi Calling to New Zealand and Australia.
You’ll also need a mobile device that supports the required frequencies. The AT&T 4G network is composed of the following bands:
- 700 MHz: Bands 12/17/29
- 850 MHz: Band 5
- 1900 MHz: Band 2
- 1700 MHz & 2100 MHz: Bands 4/66
- 2300 MHz: Band 30
AT&T’s mid-band 5G+ network requires a device that supports band n77 C-Band or n77 3.45 GHz. High-band 5G+ is available in airports, stadiums, and venues using band n260.
For more details, visit att.com/support