Keep at it. Meditating regularly is the most important thing in this course. Learn to tell who's calling by the way the phone rings. Each caller will have a unique tone. When my friend Donna calls me the ring has an impatient and insistent tone or feel.
Some people ring so p olitely the phone whispers.
Some are so happy it sings. Learn the sound and feel of your friends and family. It's a fascinating and fun exercise. Here's a fun exercise I developed. It a neat way to develop your psychic talents.