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Selectively turn off/on radios - Bluetooth
If you don’t need WiFi or Bluetooth or 3G, turn off the radios!
Settings > General > Bluetooth
Enter the Airplane mode
If you want to disable all the radios on your iPhone, the easiest way to do this is using Airplane Mode:
Location, location, location! #1
iO 5 bought with is a lot of Locations Services features, but all of these features have a negative effect on battery life.
Settings > General > Location Services
Either disable the whole lot, or selectively enable it for a specific set of apps. The more apps that can use Location Services, the more juice they’ll use.