Take extreme care while driving both, uphill and downhill. In general, nowhere in our country is road-sense of high quality, so don't expect it here. Buses, Lorries, cars, bikes and scooters, and sometimes even an auto can be reckless on these narrow roads.
Cell phones don't work uphill - neither incoming nor outgoing. However, BSNL numbers do have coverage but limited. Better to rely on the STD booths and there quite a few in the main town.