My family knows that even at the best of times I am uncomfortable on the phone. There is no difference then in whether I don't answer it because I'm Depressed or just afraid to in the first place. They all know to either leave a voice message or text - and they understand I won't immediately return either. If it is really an important matter they will ring me twice in a row. Naturally I get even more anxious but I realize it is necessary to take the call.

I always check who is calling. My cellphone (Samsung) has an option to text back various messages as to why I can't pick up the phone. Check to see if yours might do the same.