It's not so bad if that's what you want. Everyone needs to drop out from time to time, take a break, hang out the ol' Gone Fishing sign. But if you're not just opting out of the rat race for a few days, that feeling of being disconnected or having voice messages and faxes piling up is not fun.
People travel on business more than ever now.
You may be hot and weary. Jet-lagged and prone to waking up wondering where you are and why you ever took this damned assignment, maybe. Of all the hassles of travel, the worst may be that sense of disconnection. It can be a horrendously frustrating experience. Anyone who travels in the course of making a living or meeting a deadline can tell such stories.