# Resolve SIM connectivity issues on your device

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](https://support.payroc.com/en-US/core-products/roc-terminal-plus/devices/newland-n950-s/resolve-sim-connectivity-issues-on-your-device.md#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**.

> **Note:** If you're still unable to connect to the cellular network, contact our Customer Support team at **888.477.4500** or email [cs@payroc.com](mailto:cs@payroc.com).

## Related articles

- [My AXIUM DX8000 won't connect to my wireless network](https://support.payroc.com/en-US/core-products/payroc-gateway/devices/axium-dx8000/my-device-wont-connect-to-my-network.md)
- [My mobile device can't connect to my Chipper 3X](https://support.payroc.com/en-US/core-products/roc-services/devices/bbpos-chipper-3x/my-mobile-device-cant-connect-to-my-chipper-3x.md)
- [My Newland N950 can't connect to my wireless network](https://support.payroc.com/en-US/core-products/roc-terminal-plus/devices/newland-n950/my-n950-cant-connect-to-my-wireless-network.md)

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From [Payroc Support](https://support.payroc.com/en-US/core-products/roc-terminal-plus/devices/newland-n950-s/resolve-sim-connectivity-issues-on-your-device). Every page is listed in [llms.txt](https://support.payroc.com/llms.txt).