Wireless
Forgetting a Wi-Fi network erases all data about the network from your Samsung Galaxy. You’ll have to reconnect to the network and reenter your Wi-Fi password after forgetting it on your phone.
Why this works:
When your Samsung Galaxy connects to a Wi-Fi network for the first time, it saves data about how to connect to that Wi-Fi network. If the connection process changes, your Samsung Galaxy might not be able to connect to the Wi-Fi network. Forgetting the Wi-Fi network gives your Samsung Galaxy a fresh start!