1 Press to lock the screen when you do not use the phone.
2 Set the screen timeout to the smallest value: Touch > Settings > Display > Screen timeout.
3 Set the screen brightness to a lower degree: Touch > Settings > Display >Brightness.
4 Turn off Bluetooth and Wi-Fi: Touch > Settings > Wireless & networks and uncheck Wi-Fi and Bluetooth.
5 Disable background data synchronization: Touch > Settings > Accounts & sync and uncheck Background data and Auto-sync.
6 Disable data service: Touch > Settings > Wireless & networks > Mobile networks and uncheck Data enabled.
7 Disable GPS: Touch > Settings > Location & security and uncheck Use GPS satellites.
8 Use only 2G networks: Touch > Settings > Wireless & networks > Mobile networks and uncheck Use only 2G networks.
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