14 Tips for 3G iPhone Battery Saving (part 2)
6. Keep WiFi Off
The other kind of high-speed network that the iPhone can connect to is WiFi. WiFi is even faster than 3G, though it’s only available where there’s a hotspot, not virtually everywhere like 3G. Keeping WiFi turned on at all times in hopes that an open hotspot will appear is a sure way to drain your battery life. So, unless you’re using WiFi right this second, keep it turned off.
Find it in Settings -> WiFi
7. Turn Off Location Services
One of the coolest features of the iPhone 3G is its built-in GPS. This allows your phone to know where you are and give your exact driving directions, give that information to apps that help you find restaurants, and more. But, like any service that sends data over a network, it needs battery to work. If you’re not using Location Services, and don’t plan to right away, turn them off and save some power.
Find it in Settings -> General
8. Turn Data Push Off
The iPhone 3G can be set to automatically suck email and other data down to it or, for some kinds of accounts, have the data pushed out to it whenever new data becomes available. You’re probably realized by now that accessing wireless networks costs you battery life, so turning push off will extend your battery’s life. With push off, you’ll need to set your email to check periodically or do it manually
Find it in Settings -> Fetch New Data
9. Fetch Email Less Often
The less your phone needs to access a network, the less battery is used. So, set your phone to check your email accounts less often. Try checking every hour or, if you’re really serious about saving battery, manually. Manual checks means you’ll never just have email waiting for you on your phone, but you’ll also stave off the red battery icon.
Find it in Settings -> Fetch New Data