iPhone - FutureTG.com

That’s the beauty of so-called push email, contacts, and calendars. You get
push email if you have a free Yahoo Mail account (Chapter 8).You get all three
if you’ve signed up for a MobileMe account (Chapter 14), or if your company
uses Microsoft Exchange (Chapter 15).
Having an iPhone that’s updated with these critical life details in real time is
amazingly useful, but there are several reasons why you might want to use
the Off button here. Turning off the push feature saves battery power; saves
you money when you’re traveling abroad (where every “roaming” Internet use
can run up your AT&T bill); and spares you the constant “new mail” jingle when
you’re trying to concentrate (or sleep).
If you tap Advanced, you can specify either “push” (real-time syncing over the air)
or “fetch” (checking on a schedule) for each type of program: Mail, Contacts, and
Calendars, for each account you have.
And what if you don’t have a push email service, or if you turn off “push?” In
that case, your iPhone can still do a pretty decent job of keeping you up to
date. It can check your email once every 15 minutes, every half hour, every
hour, or only on command (Manually). That’s the decision you make in the
Fetch panel here. (Keep in mind that more frequent checking means shorter
battery life.)
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Chapter 16