The iPhone 3G is much faster and better than its elder sibling. however, all its snazzy features and 3G speeds consume a lot more battery than the iPhone 2G. thus, if you cannot conserve the battery life on your iPhone 3G, it might just die down in the middle of the day or in the middle of an important call.
Though the iPhone 3G definitely has better battery life than other 3G phones, it is necessary to take measures to conserve the battery life to put the iPhone 3G to full use.
Firstly, turn off the Wi-Fi feature. when the Wi-Fi scanning is on, it consumes battery continuously. Keeping it off will increase the battery life dramatically.
Keep the screen brightness down. since the colors of the iPhone are already bright, you can tune brightness down, and still view the screen clearly. Keeping it around 15% should be more than enough. You need to tune it up only in bright light.
The iPhone has an auto lock feature. What this means is that, the screen shuts down if the phone is idle for more than the set time. Keeping the auto lock feature set on one minute will save lots of energy that would have gone waste.
Keeping the 3G radio off is also a good conserver. The 3G radio constantly scans for high-speed network and you do not need high speeds throughout the day. You can switch on the 3G radio when you need it, such as during an important call or a huge download.
In addition, avoid exposing your iPhone 3G to harsh weather conditions. It consumes more battery to perform even simple functions under such conditions.
Keeping these features in check will greatly save your battery’s life. You can always use the 3G’s special features when you really need them, but otherwise the phone will function better in the 2G mode.