If your mobile phone is slow or in any other way doesn't work or respond as well as it should, it may help to restore the factory default settings. This deletes all configurations you've made in your mobile phone.
Press arrow right to access the main menu.
Restore factory default settings
Press reset your phone.
Press yes to accept.
Press yes to confirm.
Wait a moment while the factory default settings are restored.
Follow the instructions on the display to set up your mobile phone and prepare it for use.