Recruiters have much more information and practice with negotiation relative to job candidates. The pressure of a phone call and our desire to please others means that phone calls become dangerous places where engineers shoot themselves in the foot. Too many tech employees keep speaking on the phone call and end up revealing too much.
This information asymmetry clearly favors the recruiter, who can read your emotions and take advantage of the knowledge gap to lowball you.
For that reason, you should prefer to eliminate phone calls or keep them short, and then be deliberate about your emails where you can craft the exact message you want to send. Async communication is also better for clarity and you can research on your own.