SettingsSetting the date and time1. Go to Settings > System > SYSTEM > Date & time.2. Do any of the following:To use the network date and time, select the Automatic date & time check box.To set the date and time manually, clear the Automatic date & time check box, and then tap Setdate and Set time respectively.To use the network time zone, select the Automatic time zone check box.To set the time zone manually, clear the Automatic time zone check box, tap Select time zone,and then choose a time zone.To switch between the 24 -hour and 12-hour formats, select or clear the Use 24 -hour formatcheck box.To choose the display format of the date, tap Choose date format.Setting the language1. Go to Settings > System > SYSTEM > Language & input > Language .2. Select the display language that you want to use.Setting the input method1. Go to Settings > System > SYSTEM > Language & input > KEYBOARD & INPUT METHODS >Default .2. Select the input method that you want to use as the default.Setting a screen lockGo to Settings > System > PERSONALIZE > Security > Lock Screen to select a screen lock optionand set up the screen lock.Enabling app installationBefore you install apps that you downloaded from unknown sources, do all of the following:1. Go to Settings > System > PERSONALIZE > Security > DEVICE ADMINISTRATION .2. Select the Unknown sources check box.Setting the ringtoneYou can define the default ringtone for incoming calls, messages, and notifications. You can also adjustthe volume for each sound type.Go to Settings > System > PERSONALIZE > Ringtones and Volumes .Performing a factory reset1. Go to Settings > System > SYSTEM > Backup & reset > PERSONAL DATA > Factory data reset .2. Tap Reset phone.