Removing a WIFI network from a mobile device

For Android (general instruction using Google Marshmallow):

1. Open Settings on your device, and tap on the WiFI icon to access WiFi network options.
2. Tap and hold the WiFi network you want to delete, then select Forget Network from the menu that appears.

For iOS (using iOS 9.2.1):

1. Open Settings on your device, and tap on the WiFI icon to access WiFi network options
2. From the list of WiFi networks, select the one you want to delete, and tap Forget This Network from the details page.

For Windows 10 Mobile:

1. From Settings, tap Network and Wireless, then WiFI to access wireless network options.
2. Tap and hold the WiFi network you want to delete, then select Delete from the menu that appears