Here’s a complete list of options you can do to extend the battery life of your iPhone 3G. This is according to Apple.
Turn off 3G
Minimize use of GPS
Fetch new data less frequently
Turn off Push Mail
Auto-check fewer Email Accounts
Minimize use of 3rd-Party Applications
Turn off Wi-Fi
Turn off Bluetooth
Use Airplane Mode in low- or no-coverage areas
Adjust Brightness
Turn off EQ
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