I work as a software developer for a company in the US. We recently got a new CTO, and today he went around asking for cell phone contacts for everyone. That information is already in my file with HR, and my direct boss has it as well. Having been on the job for about 10 years, I can honestly say I've never had a CTO ask for this, nor can I think of any real reason he would be contacting me directly.
Am I obligated to give him my personal cell phone number?