Look, being able to talk on the phone is an important skill and you are going to have to do it for many important things in life. I too don't really like talking on the phone so I can sympathise. The only solution to this problem is practice and more practice. Call your friends and play different roles. Begin it with someone you trust and build it up from there. If I am honest, I think a lot of people don't like talking on the phone. However, some have intense fears, like you and like I used to. The one thing that helped me was just doing it more and realising that as we grow older, we will have to become a little more resilient.