Let's assume that I and a pal are hiking in the Gobi Desert, or some locale equivalently remote, each of us packing one of today's costliest, most tricked-out smartphones. The closest cellphone repeater is well over the horizon, so obviously Google Earth is not an option. Absent access to the cellular network, or to satellites, can the two phones communicate at all (at, say, a distance of a kilometer from one another)?, functioning as what we used to call "two-way radios?" I suspect not, but it would be useful to have informed opinion.

cordless-ially,