A method of routing telephone calls, emails and faxes using a palmtop computer. Using a date book forming a part of a personal information manager application of a palmtop computer, the user enters an appointment into the date book. Such an appointment has a starting and an ending time. The user then selects (either at the time of entry of the appointment or after receipt of an alarm reminder of the appointment) a destination telephone number for routing of telephone calls between the starting time and the ending time. This selection can be in the form of a menu selection of a predetermined profile for routing telephone calls. The palmtop computer then sends a representation of the destination telephone number, the starting time and the ending time to a telephone call server (and/or email server and/or fax server), so that the telephone call server routes telephone calls to the destination telephone number between the starting time and the ending time.