Resetting the network settings on your Samsung phone can resolve network connection problems.
Note: Performing this action will delete all network settings, including saved Wi-Fi networks and Bluetooth connections. It will not delete any apps, data, or contacts.
From the home screen, swipe up to open the menu.
Tap Settings.
Tap General management.
Tap Reset.
Tap Reset network settings.
Tap Reset settings.
Tap Reset..
After the network settings on your Samsung phone have been reset, you might have to reconfigure certain settings, such as Wi-Fi.