IPhone 3G/4G vs. WiFi battery life.

Ok, so obviously using WiFi over 3G/4G will increase your battery life on any device. However the question I have is with regard to how the iPhone and iPad manages those connections. If I go into settings and toggle my WiFi on and toggle 3G/4G/Cellular Data off, WiFi is the only internet connection protocol on, which betters battery life. However, what happens to my battery life if I toggle my WiFi on, and leave 3G/4G/Cellular Data on? Does the iPhone intellegently turn off cellular data while using WiFi in order to achieve that same increase in battery life? Or does the device leave both WiFi and cellular data on, destroying battery life? Or does something inbetween happen, like WiFi potentially turning off when the phone goes into standby?
I've been curious about this for a while and I've gotten many different answers from people, ranging from genius bar employees to iOS software developers.
I'm sure I'm not the only one wondering this.
Thanks, guys.

I have this problem also since V3 - but it is just a display problem, the actual battery life is fine. It most commonly fails to recharge (on the display menubar) though the display on full-screen is fine. A reset restores it but the problem will recur.
More seriously the same problem affects phone connection; we are near the edge of coverage and the menubar will show 'no coverage' even in a strong signal until the phone is reset (it never changes on its own). Sometimes it seems this is true (that is the phone does not connect) other times it seems just the display.

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I see the same thing after upgrading to ios8 on my iphone 4S.
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diesel vdub wrote: With every iOS update there is an extremely small minority of users (less than 1%) that seem to experience problems and cannot phathom that the issue is not affecting millions and is not widespread. Apparently when the issue affects you personally it's impossible to accept that millions and millions of users are not experiencing the same problems or accept that the issue is with your device specifically.
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Hello LynzieMichelle21,
The information detailed below may help resolve this issue.
This solved my question by Philly_Phan on Jun 21, 2012 4:43 PM
Philly_Phan
It's probably the battery indicator, not the battery itself. Run it down until it shuts down automatically. Ignore any low battery alerts that appear. Then, charge it overnight with the 10W charger. That should clear things for you.
My IPad doesn't charge 100%
See the answer in context
My IPad doesn't charge 100%
https://discussions.apple.com/thread/4047393
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Good Luck!
Message was edited by: SFC @rcher

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Hi Smilesalong,
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