Probably not what you want to hear: exposure.
I got a job where I had to make lots of phone calls, and generally use a phone very much every day (I’m in HR, so I worked with recruiting so I had telephone interviews etc).
Before this, I was terrified of making phone calls, I used to need to write down exactly what I was supposed to say before making a call. Now, I don’t mind phone calls.
It was a rough few weeks before I got used to it, but honestly made the world of a difference, and it has lasted even though I’m at a different job now.
(Worth mentioning: I have a master’s degree in psychology, and exposure really is the way to go when working with fear/anxiety. Look up “exposure therapy” if interested).