To dream of a phone number represents what is required of you to initiate a desired experience. A resource, ability, person, or situation that you need in order to make something happen.
Example: A woman dreamed that her work number had been disconnected. In waking life she had just returned to work after having a baby and was struggling to find a purpose to believe that work was more important than being at home with her child. The disconnected phone number represented her inability to make work feel important.