To dream of a telephone or a ringing telephone represents a signal or psychic communique from your subconscious. It means that you may have to confront something directly when you have been evasive. The phone generally can be a symbol of how you relate to other people.
To dream that you don't wish to answer the phone indicates that you have trouble communicating. You are attempting to deflect some circumstance or affair.
To dream that you are talking to an acquaintance on the phone means that something involving that individual needs to be dealt with. It could require committing some part of your inner self.