Apple iPhone OS 3.1 - Manual (Page 19)

Settings provided by a configuration profile cannot be altered. If you want to change
these settings, you must first remove the configuration profile or install an updated
configuration profile.
Remove a profile: In Settings, choose General > Profile, then select the configuration
profile and tap Remove.
Removing a configuration profile deletes the settings and all other information
installed by the configuration profile from iPhone.
Disconnecting iPhone from Your Computer
Unless iPhone is syncing with your computer, you can disconnect it from your
computer at any time.
When iPhone is syncing with your computer, iPhone shows “Sync in progress.” If you
disconnect iPhone before it finishes syncing, some data may not get transferred. When
iPhone finishes syncing, iTunes shows “iPhone sync is complete.”
Cancel a sync: Drag the slider on iPhone.
If you get a call during a sync, the sync is canceled automatically and you can unplug
iPhone to answer the call. Connect iPhone after the call to finish syncing.
19 Chapter 1 Getting Started