A lot of people have anxiety around phone calls, it's quite common really
What is the angst though? I suppose if you are expecting a difficult call or bad news then fair enough, but chatting to friends and family-that's nice.
Disclaimer-I spent many an hour sat on the stairs as a teen chatting to my friends that I'd just spent all day with, phoned my Granny every week, and every job I've ever had involved speaking to people on the phone. I don't think teenagers have to do it enough now. If you wanted to make an appointment/plans when I was young you had to pick the phone up.