I do similar to Colin, but say that the
office is closed, and don't give a timescale for a little bit of security. Again like Colin, most of my work is repeat and recommends, so they will wait. I leave an emergency phone number of a trusted colleague.
I also clear my caller ID so when I return I can pick up those who haven't left a message.
I wont take my business mobile on holiday with me (if overseas), I'm on holiday, I don't want to be working.
Because you can't book the weeks you're away (it's like having a full diary for those weeks), you should already have work lined up for the week you return. If I have travelled long haul, I allow a few days off on return 'cos I suffer something terrible with jet lag.
And finally, I don't broadcast on the forums that I am going away. I know some do. You never know what low life is looking in.
Safe and happy cleaning

The Ken