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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.