If you are having trouble connecting to the Internet you may need to reset your network connections. Resetting your network connections will disconnect any Bluetooth devices connected to your device and disconnect your device from any Wi-Fi networks it is connected to.
1.
From the Home screen, tap Settings.
2.
Scroll to Reset.
3.
Tap Reset.
4.
Tap Reset Network Settings.
Resetting your network settings will reset all your Wi-Fi, cellular, and VPN settings.