First you have to have a jailbroken iPhone with openssh installed.

You must then log into your iPhone - I use putty, but any ssh client will work

Navigate to "/private/var/mobile/Library/Preferences"

cd /private/var/mobile/Library/Preferences

The file that needs work is com.apple.persistentconnection.plist, back it up by typing the following

"cp com.apple.persistentconnection.plist com.apple.persistentconnection.plist.bak"

Once backed up, you need to convert it from binary to xml, type the following:

"plutil -c xml1 com.apple.persistentconnection.plist"

now you can edit it,

"nano com.apple.persistentconnection.plist"

What you are looking for is "integer 900 integer", 900 is the amount of seconds that it takes to fetch email, I set this to 300 (5min).

Now check owner ship, it should be mobile:mobile, if not

"chown mobile:mobile com.apple.persistentconnection.plist"

When done, reboot. All done!

Do note that under settings the Fetch option will show Manual

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