My T has a business number that rings directly to voicemail. That's the number I usually call to leave a message when I want to talk to her, and that's the number that shows up on my phone when she returns my call. Eventually she gave me a cell number, but I don't know if it's business, personal, or both (the outgoing voicemail message is very generic and just says "You have reached [first name], please leave a message."). I only call that number if, say, I just barely missed her call and want to call her back right away. I would also use her cell number in an absolute emergency, but I've never had one of those. We don't text.