We have three Palm Pre Plus phones in our household. One of them has never shown the name and number of incoming callers, even though the names and numbers are in the user's "contracts" list. All she gets is "Unknown Caller." The other two phones work just fine in this regard.
Any ideas why this might happen, or how to get the phone to display this information?
The first thing I would do is get in my Verizon account on-line, look at the details of the plan for that particular phone and make certain caller ID is, in fact, enabled. After verification, I would call in for technical support.