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.