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.
Note: If you're having messaging, email, or internet connectivity issues, resetting your network settings may help.
From the Home screen, drag down the Notification panel.
Drag down the Quick settings panel.
Tap the Settings icon.
Scroll to System.
Tap Reset options.
Note: Resetting your network settings will reset all your Wi-Fi, cellular, and VPN settings.