'Darfoni Pocket Wireless Communicator'
A collaboration between Guglielmo Marconi and Alan Turing might have produced this Edwardian mobile telephone, complete with bell, digital key-pad, individual squelch and volume controls, and separate transmitting and receiving aerials. And all designed to fit conveniently in any pocket! Well, if you have trousers to suit an elephant perhaps, and preferably lead-lined.
And more information here.