The phone patent was actually filed in 2007, so this goes to show you how long Palm has been working on the Palm WebOS.

As decribed in the patent filing: A mobile phone filters phone calls based on priority. The mobile phone determines a call priority of an incoming phone call based on the caller's telephone number. The mobile phone also determines a threshold priority for the current time period based on a priority schedule. The mobile phone compares the call priority with the threshold priority to determine whether to block the incoming call. If the mobile phone blocks the incoming phone call, it may transmit a message to the caller suggesting a time for the caller to make the phone call again.