How to Reset Network Settings on Samsung Galaxy

Open your Galaxy's Settings. You can do this by dragging down the notification bar at the top of the screen, then tapping the gear icon at the top-right corner.

Scroll down and tap General management.

Tap Reset. It's under the “RESET” header.

Tap Reset network settings. It's the second option from the top.

Enter your phone or tablet's PIN and tap Done.

Tap Next.

Tap Reset Settings. All of your saved Wi-Fi access point names, passwords, and other network information will now be wiped clean.