To use Wi-Fi as you wish, you can redefine how and when the POS terminal connects to the network. When Wi-Fi is enabled, the device automatically connects to nearby Wi-Fi networks that you have already connected to.
To enable Wi-Fi and connect to the network:
Go to the your device’s Settings.
Tap “Network and Internet” and then “Wi-Fi”.
Tap the Wi-Fi network of your choice in the list.
Enter the password and tap “Save”.