If your device can't connect to the 4G cellular network, you must check that you've inserted the SIM card correctly and that the access point name (APN) settings are accurate.

Step 1: Check the SIM card

1. Confirm that you've inserted the SIM card correctly.
2. If you've inserted the SIM card correctly, complete the following steps to reboot the device:
   1. Hold the power button.
   2. Tap Reboot.
3. After the device restarts, check if the 4G symbol appears on the screen, and then complete one of the following actions:
   • If the 4G symbol appears, run a test transaction.
   • If the 4G symbol doesn't appear, go to Step 2: Check the APN settings.

Step 2: Check the APN settings

1. On the main screen of the device, tap the Main Menu icon ≡.
2. Tap SETTINGS, and then tap SIM Config.
3. If you're prompted to complete the action, tap Just Once.
4. Scroll to the bottom of the screen, and then tap Access Point Names.
5. Tap +, and then enter the following details:
   1. In the Name box, enter Payroc ATT.
   2. In the APN box, enter optconnect01.com.attz.
6. Tap [Ellipsis image], and then tap Save.
7. Tap APN profile.
8. Wait up to 30 seconds for the 4G symbol to appear on the screen, and then complete one of the following actions:
   • If the 4G symbol appears, run a test transaction.
   • If the 4G symbol doesn't appear, complete the following steps to reboot the device:
     1. Hold the power button.
     2. Tap Reboot.