A phone call in your dream is parallel to a real phone call in the real world. A phone call in a dream can have many meanings and have various affects on your physical self. A phone call can be a point of realization, where the dream has hit a climax, or a significant turning point. The phone call can be something you’ve been waiting for, which can be relevant to something or someone you desire.
Physically, a phone call can be similar to other affects as jumping off something in a dream, the loud noise can usually be a point where the dream stops, and the dreamer wakes up, leaving the dream unfinished.