> For the complete documentation index, see [llms.txt](https://docs.monogoto.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.monogoto.io/getting-started/general-device-configurations/cellular-modems/smart-cash-register-configuration-to-use-cellular-sim-as-wifi-backup.md).
# Smart Cash Register Configuration to Use Cellular SIM as WiFi Backup
1\. Press on **internet settings** in the tool bar.
2\. Press and hold **Cellular** button for a few seconds.
3\. You should see **Go to Settings** button appear, please press on this button.
4\. When Cellular settings open, please press on **Advanced options**.
5\. Press on button **Add an APN**.
6\. When the APN configuration window opens, please enter profile name and APN. Below you can see example showing the **go.mono** being used in a device.
7\. After entering APN and profile name, please scroll down and mark **Apply this profile**. This will set this new APN as a default APN in this device.
8\. To save our APN settings, please press on **Save** button.
9\. After saving APN, please enable data roaming, by selecting **Roam** under **Data roaming options**
10\. Now to set this cellular data to be used when there are issues with WiFi, please select When Wi-Fi is poor under Use cellular instead of Wi-Fi.
11\. To apply the settings to the device, please click on **Cellular** to disable it and then again click on **Cellular** to enable it.
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