If you were the one who left the phone message to somebody else it means that you have something to say, but didnt have an opportunity to do so, therefore you tell those things on the phone message. If somebody else has left the phone message to you, you will get the news soon that will be important for you to know.
Dream dictionary: Phone message dream meanings
Seeing or hearing a phone in a dream means a message from your subconscious. You can face issues that you are trying to avoid. Or, a phone can represent your communication and relationship with others. To dream that you wont talk on the phone represents a situation you want to end. Dreaming of talking on the phone with someone means that you want to face that person about an issue.
The telephone is the form of communicating with others, therefore such dream could indicate your will to be heard. The telephone call could also mean that you will get an important message. If you call for help on your phone, there is some reason why you did it. Perhaps you need help.