With the start of the unit call system, an unforeseen rush of popularity is visited upon the pay telephone. Before the switch, "Let me use your phone a moment" was a common byword, but now that each call costs two sen the phone owner is apt to scowl and would-be borrowers are forced to reconsider. Studies are made of the possibility of placing simple automatic pay-on-the-spot phones in theaters, hotels, large stores and other convenient locations.