Originally Posted by DMSFCA

I had a loft in the city that had one of those keypads at the front door that would call your cell phone. The UPS guy would call and I could be anywhere in the world and buzz him into the secure foyer to drop off a package. Worked well.

I suppose you could argue that I wouldn't really know it was the UPS guy since I couldn't see him but in the world of things I care about, that was pretty low-risk and he was only getting as far as the foyer.