It seems like a very egalitarian, Scandinavian approach to divine pronouncements. No matter whom you are, you may dial the number and hear your voice echo across the land. Via Unsworn Industries:
Telemegaphone Dale stands seven metres tall on top of the Jøtulshaugen mountain overlooking the idyllic Dalsfjord in Western Norway. When you dial the Telemegaphone’s phone number the sound of your voice is projected out across the fjord, the valley and the village of Dale below.