I've only officially got his office number. However, once he called me from a cell number, I'm assuming it is his. He said to call back on the office number though.

So, I've never used the cell number. How's that for keeping his boundaries without him even asking! The only reason it is saved in my phone at all is so i don't ignore the call next time...I do that with everyone I know though. I have three phone numbers for each of my friends...etc.