These advises apply to iPhone users, especially iPhone 3G users (since the battery life is weaker for the 2nd iPhone).

1. First thing to do of course, is to turn off “bluetooth”. Apple didn’t make of it a very interesting feature after all since you can’t send/receive anything from a computer or other device. No regrets then.
2. Second thing to do is to turn off the auto-brightness and be sure you didn’t set the brightness to the max (a bit more than 50% is ok).
3. Turn off push and sync your iPhone from iTunes like you used to before.
   If you really want to keep “push” for emails, you can at least turn it off for calendars, bookmarks and contacts.
   It’s also better to set “fetch” to manually.
4. Don’t hesitate to restart your iPhone from time to time to give it some “air” to breathe.
5. I remind you, you can also force quit applications from your iPhone just like in a Mac, by pressing and holding the Home button until the crashing application quits.
6. Turn off Wi-Fi when you’re not using it, free hotspots are rare in most of the countries after all.
7. You can also just turn off the phone when you don’t need it (theater, club or else) or just turn on Airplane mode.
8. When you charge your iPhone, be sure you make full cycles, it’s better to charge it when you have 20% and less battery remaining (not before).

Posted in Macintosh Tips & Help, iPhone & iPhone 3G