Review the Turn off Mobile data prompt, then select the Checkmark icon. Note: Data roaming is off by default. Enabling Data roaming will allow the device to attach to foreign wireless network signals when available. International roaming charges will apply. This setting does not apply to voice access which requires additional provisioning for usage on international networks. To learn more, visit the AT&T International Calling website.
Scroll to and select Data roaming to turn it on or off.
ADJUST MOBILE NETWORK & DATA CONNECTION: Select Mobile networks.
Select the desired setting. Auto on/off will only turn on mobile network connection when Bluetooth connection is lost. Always on will maintain a connection to the AT&T mobile network at all times, in the event that its Bluetooth connection to your phone is lost. Always off uses the least amount of battery power, but its feature availability is limited when a Bluetooth connection is lost.