Slow iPhone calander update

When I enter an event on my Mac within minutes my MobileMe calendar is updated but It takes at least an hour or more before my iPhone is updated. Why does this happen?

Just after the launch of mobileme and all the problems that came with it, Apple corrected their initial claim that mobileme uses push technology to syncronize your calendar etc. with your iPhone. They said that the push techology used by mobileme is not real push technology but instead uses a 'timed operation'. That would explain your observation.
I was looking up some reference material for you but I can't find it anymore. Perhaps they now do use, after implementing many improvements on mobileme, real push technology and in that case you need to check the settings on your iPhone to get changes made on your Mac reflected immediately.
Go to> settings> fetch new data> make sure 'push' is on.
Hope this was helpful.

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