The comment is missing everything useful. If it was public, I'd definitely ask for docs on it: What is the phone number for? When I read it, is it ready for di

The comment is missing everything useful. If it was public, I'd definitely ask for docs on it: What is the phone number for? When I read it, is it ready for display as-is or should I be formatting it? Same question when I set it. Can it be null or empty? Does or can the system use this number for anything - such as sending SMS messages? Being static is a huge red flag, though, and even though it's private I'd still ask. Why is it static? Is this thread-safe (and how)? What context does it get set in, and when can I use it?