[OSX-Users] Re: iPhone 3.0 battery life?

[Hugh Glaser]

On 19/07/2009 16:52, "Ben Hodgson" <bmjh106 at ecs.soton.ac.uk> wrote:

> Doesn't both push and polling operate over any old standard TCP/IP connection
> (which AFAIK the iPhone has)?
> 
> Disclaimer: I'm getting into "I'm not 100% sure what I'm talking about"
> territory.
Welcome to my planet.

http://www.apple.com/batteries/iphone.html
says:
Optimize Your Settings:-
Turn off push mail: If you have a push mail account such as Yahoo!, MobileMe
or Microsoft Exchange, turn off push when you don¹t need it. Go to Settings
> Mail, Contacts, Calendars > Fetch New Data and set Push to Off. Messages
sent to your push email accounts will now be received on your phone based on
the global Fetch setting rather than as they arrive. If the global Fetch
setting is set to Manually, you will not be able to locate your iPhone using
the MobileMe Find My iPhone feature.

I'm pretty sure that when I installed 3.0 I was getting seriously reduced
battery life until I switched it off (although that was a beta version).
In normal usage it doesn't actually connect up unless it feels it needs to,
as far as I can tell, irrespective of the time setting.
Given the arrival frequency of email I get, switching off Push must be a big
battery win.

And Tim, if you have Push switched on for other apps as well, it may be even
worse.

Cheers
Hugh
> 
> -- Ben
> 
> 
> On Sun, Jul 19, 2009 at 4:48 PM, Marcus Cobden <mc08r at ecs.soton.ac.uk> wrote:
>> 
>> On 19 Jul 2009, at 16:35, Philip Boulain wrote:
>> 
>>> Hugh Glaser wrote:
>>>> I think you may find that "push" is on by default.
>>>> If you switch it off, going back to polling for email...you may get
>>>> back to "normal".
>>> 
>>> That seems odd. Isn't the point of push mail that it's more
>>> efficient, avoiding the need for the phone to keep transmitting
>>> "Hey! Do I have any mail yet? What about now? What about now?"
>> 
>> The design choice probably came down to cost.
>> It's cheaper and easier to code it that way than to ask the carriers
>> to invest in new hardware and software updates on their networks so
>> they can do it right.
>> 
>> 
> 
>