Scared of phone calls? The dread is always longer than the actual call.

The dread does the heavy lifting, not the call. You rehearse it for two days, run every version of the conversation, and the real thing takes ninety seconds and goes fine. Phone anxiety is common and not a character flaw, it is mostly about not being able to see the other face. The waiting is the expensive part of the whole process.

Make the call early in the day rather than letting it follow you around. Write your first line down, say that, and let the rest be ordinary.