You might want to connect to Wi-Fi instead of using mobile data sometimes. This can help if you don’t get a good cellular signal in some places or have a limited mobile data plan.
On your Home screen, tap Settings.
In Settings, tap Network & internet > Wi-Fi > Use Wi-Fi.
Tap the name of a Wi-Fi network you recognize and trust.
Enter the Wi-Fi network password, then tap Connect.
After your Surface Duo is connected, a number appears on the Wi-Fi icon. That number tells you the Wi-Fi network version.