MobileMe, iPhone: Use WiFi or 3G when syncing for the first time
Summary
When you first enable MobileMe syncing of contacts, calendars, or bookmarks on your iPhone, it may take a few minutes for your data to completely sync down.
Products Affected
.Mac Sync, MobileMe, iPhone
To help improve performance of the initial sync, make sure you are connected to a WiFi connection (or, if you have a 3G iPhone, are in a location that has a good 3G connection). Syncing works over Edge; however, during the initial setup a large amount of data may be downloaded to your iPhone, so connecting via WiFi or 3G is recommended.
Note: A sync is complete when the spinner icon is no longer present at the top of Contacts, Calendar, or Safari Bookmarks.