the power key , and selectDeactivate power saving.• When you are listening to music, anddo not want to make or receive calls,activate the offline profile.• Mute unnecessary tones, such askeypad tones.• Use wired headphones, rather thanthe loudspeaker.• Activate a dark theme and wallpaper.Select Menu > Help & Settings >Settings and Themes > General. Tochange the wallpaper, on the homescreen, select Options > Changewallpaper• Deactivate background animationeffects. Select Menu > Help &Settings > Settings and Themes >General > Options > Themeeffects > Off.• Deactivate the Big clock screen saver.Select Menu > Help & Settings >Settings and Themes > Screensaver > None.• Change the length of the time-outperiod after which the device displayswitches off. Select Menu > Help &Settings > Settings and Phone >Display > Light time-out.• Decrease display brightness. In thedisplay settings, select Brightness.• Set your device to retrieve mail lessfrequently. Select Menu >Messaging > Mail > Settings, yourmailbox, and Sync frequency. If youhave additional mailboxes, you mayneed to set the retrieval frequencyseparately for each mailbox.• If the network mode is set to use bothGSM and 3G (dual mode) networks,the device searches for the 3Gnetwork. To set your device to useonly the GSM network, select Menu >Help & Settings > Settings andConnectivity > Network >Network mode > GSM.• Deactivate Bluetooth when notneeded. Select Menu > Help &Settings > Settings andConnectivity > Bluetooth >Bluetooth > Off.• Stop your device from scanning foravailable Wi-Fi networks in thebackground. Select Menu > Help &Settings > Settings andConnectivity > Wi-Fi > Options >Settings > Show Wi-Fiavailability > Never.• When connecting to the internet, usea Wi-Fi connection, rather than apacket data (GPRS or 3G) connection.• Set the packet data connection to beestablished only when needed. SelectMenu > Help & Settings > Settingsand Connectivity > Admin.settings > Packet data > Packetdata connection > When needed.• Close the applications you are notusing. Press and hold the menu key,swipe until the desired application isdisplayed, and select .• If the signal strength of the cellularnetwork varies in your area, itincreases the demand on batterypower.Restore original settingsIf your device is not working properly, youcan reset some settings to their originalvalues.1 End all active calls and connections.2 Select Menu > Help & Settings >Settings and Phone > Phonemanagement > Factory settings >Restore.3 Enter the lock code.20 Basic use