Phone number or other contact info. Supposing you’re on good terms, they’re not someone you’re interested in romantically or the like (so none of the anxiety from that at least), what’s kept you from asking?
Supposing that something has on occasion, anyway.
If others act and assume similarly, this could create something of an isolation trap, couldn’t it?
Yes. I didn’t say it’s a good way to live, it’s just what I do. I’m working on it.