Here’s what I’m doing to get the most juice out the iPhone, let me know if you got any good ideas.

As soon as I know in walking into a wifi zone such as university or home then i make sure wifi turns on. I believe when connected to wi-fi the 3g chip will automatically turn off.

3g is most definitely a huge drain so I’m only using it where speed is beneficial otherwise for basic data sync and mail I don’t mind being drip fed data on edge.

Searching for cell towers is another drain so being out if reception kills the battery faster. If you’re on underground or somewhere where you know there is no reception - immediately switch to ‘airplane mode’ to save unnecessary searching.

I keep the settings tab visible on the front screen to make the changes easy to access. It’s a shame the options  arent all on a single page.  Airplane node is the first thing you see after pressing settings but the 3g switch is another menu level deeper.
Bluetooth should always be off unless you are using the headset which I only use if typing alot, doing something where the cable might get in the way, walking around with shorts which have have no pockets or of course driving

The screen brightness should be set as low as possible obviously. Unless you are hard of sight, the lowest light level is fine for most purposes; I’ve only needed to increase this when showing off the device to others.

And on the odd  occasion you might be using the location aware services that can be turned on manually otherwise keep that GPS chip off!

Apple distribute the iPhone with all these bells and whistles switched on like a show room with all appliances and lights switched on  - but turning them off will increase battery life considerably.

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