View signal strength, network connection status, and enable/disable mobile network and international roaming.
INSTRUCTIONS & INFO
Swipe down from the top of the screen to reveal the Action Center.
Tap ALL SETTINGS.
Scroll to, then tap cellular+SIM.
To enable or disable cellular data, tap the Data connection switch. Note: Mobile data is on by default. Turning off the mobile data will not allow any data to be transferred over the wireless network. Wi-Fi access, voice function, and standard text messaging are still allowed.
To change roaming options, tap the Data roaming options field and then tap the desired option. 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.