I have been working with a couple of iPhone apps recently and in all cases I ve had to set up an Over the Air install client to distribute the apps to all the dev devices. My friend, Ulf wrote a ruby cms (hosted on github) for this very purpose (Thanks Much!). Here is a bug that seems to have baffled some people and never been an issue for some people.

Bug: The app installs but as soon as it does, the icon disappears from the screen.

This can be irritating, understandably.

Issue: The app id doesn’t match the provisioning profile.

Fix: Found Here

It turns out to be that the bundle-identifier in the app-info.plist file did not match the adhoc provisioning profile identifier. This property has to match the APP ID in the provisioning portal that you created the profile with.
i.e. My APP ID = com.TheApp.*
WRONG:
bundle-identifier
com.SomeOtherName.Whatever
CORRECT:
bundle-identifier
com.TheApp.TheAppName
Also, make sure that you replace ‘TheAppName’ with the same value as ‘Product Name’ in your project + target settings.