Until 2 years ago I worked a place outiside of the city where commercial service was spotty at best. To keep communications open with key personell (It was a very large summer camp) we utilized both two way radios, and for other people who just needed to be called to a telephone we actually just set up our own internal pager system. It was pretty cool and actually saved us money. (I thought it was cool, people who had to carry around the darn pagers wanted to kill me for setting it up.)