Mount Everest, Earth's highest mountain, now has 3G coverage. Nepalese carrier Ncell has installed 3G base stations along the trekking route to the Mount Everest base camp. Apparently 50,000 tourists visit every year.
According to the Economist it has not yet been tested whether or not you can actually get a signal on the summit at 8848m. Where is Reinhold Messner when you need him? I guess he would not approve of the 3G service intruding the mighty Mount Everest. On the one hand it is useful to get weather information and stay connected. On the other hand climbing is about experiencing nature and not updating Facebook.
The base stations Ncell deployed are powered by solar panels and are especially equipped to handle the cold. See also this NY Times story.