Voice mail
"Hello, this is the Doctor. As you probably have realised, I'm sadly not in at the moment. Well actually, since I'm not one to sleep, I highly doubt you'll catch me at all on my phone. Don't really see the point in using a room if you're not there to sleep. Have no idea why I actually got one anyway, twenty minutes every few days is more than enough to get me by...ohh dear...I'm rambling again aren't I?"
*beep*
*beep*