Telephones are powered by the wire that brings in the call. It has nothing to do with the building electricity. The voltage needed is so small it can be supplied by the wire.
Motts - you are wrong. There is a bunch of people my age who grew up with DOS and Windows 3.1 who would love to get old boxed software to digitally archive.
I spent quite some time making a working Win 3.1 "system" in Dosbox because I miss my first computer that much.
Motts, I love your "infinity perspective"-style photographs the best of all. You have that special way of catching contrast and distance to make those kinds of photos incredibly good. I am seriously envious.
Not to mention you have brass balls..."Entire hallways would light up as you walked down them, all motion sensor triggered." Yeek!
@ Larry D - did that actually happen to you personally???
@ jessef - taking stuff is generally a nono in the urbexing code of honor, but if you really want it, just don't be seen entering or leaving the place and don't show off your new toy to anyone in that vicinity. (just in case some old-timer goes "hey, didn't that used to be in my school?")
@ Urban - not to threadjack but you can play Silent Hill even if your PS1 broke like mine did; grab a program called Epsxe. It emulates a PS1 and can play SH start to finish without a single problem, I've done it.
@ Guitorman - I heard about a lab that had to move heavy containers of anything dangerous by putting it in the elevator, getting out, and having someone downstairs push the call button.
There was literally no other way to move anything you couldn't carry besides the stairs. And lugging, say, a big container of liquid nitrogen down a set of stairs is akin to playing Russian Roulette with a shotgun.