If you have problems using network configurations on your phone, such as mobile data, Wi-Fi or Bluetooth, resetting the network settings may help.
Slide two fingers downwards starting from the top of the screen.
Press the settings icon.
Press General management.
Please note that all saved APN connections, you've created, are deleted.
Press Reset mobile network settings.
Press Reset settings.
Please note that all saved Wi-Fi and Bluetooth connections and passwords, you've created, are deleted.
Press Reset Wi-Fi and Bluetooth settings.
Press the Home key to return to the home screen.