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What uses more battery on iPhone? Edge, 3G, Wi-Fi?

I have an iPhone 3GS and I have several combinations to keep it connected.
I find everywhere that wi-fi uses less battery than 3G, so I should use wi-fi with 3G to save battery power.

My question is: what combination should I use to save battery the most?
Edge alone
Edge + wi-fi
3G + wi-fi
1 Solution
I'd guess the first one, but that would just be a guess.  Why not try each one while running one of the Battery Magic apps and time how long it takes to go from 100% to 95%?
Alan HardistyCo-OwnerCommented:
I have found that switching 3G Off and only using 2G makes no noticeable difference to my battery life at all.  3G sucks the hell out of the battery and Wi-Fi is my connection of choice, but then I don't use my iPhone for calls etc, just for email and web browing (on EE) and even then it can't last a day!
The iPhone is configured to use the fastest conenction that it can find, so it will always be switching if you are constantly mobile.
Here is a link from Apple on how to get the most out of your iPhoen battery:
I believe if you're connected to wifi+3G, your phone will use wifi for most/all data, but 3G is still needed for calls. If wifi is available I'd say use wifi+edge. Wifi will handle data, edge will handle calls, and you won't have 3G draining your battery.
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martinewskiAuthor Commented:
We all agree 3G is the iPhone´s battery drainer.
I use the phone mostly for data. So, the question could be simplified. If I´m on 2G, I have the option to use the Edge network or joining a wifi network.
The question could be: does wifi uses more power than edge? If it does, using only edge is the best to save battery. If it uses less than edge, than edge+wifi is the best option.
Alan HardistyCo-OwnerCommented:
According to metagrapher on http://theappleblog.com/2009/06/25/iphone-3-0-battery-draining-heres-a-possible-fix/
Wi-Fi radio consumes the least battery power, then the 3G radio, then BlueTooth.  So I would stick to Wi-Fi, then Edge.  Turning off Push (which communicates every 30 seconds) will also drain your battery.
martinewskiAuthor Commented:
I know Wi-Fi uses less power than 3G. But does it use less power than Edge? I can't find that answer from a reliable source.
Alan HardistyCo-OwnerCommented:
Please check out this page just after the initial graph which says that wifi uses less battery power than edge:

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