The monosodium salt of 3-pyridyl-1-hydroxyethylidene-1,1-bisphosphonic acid in new amorphous forms, methods of preparation and a pharmaceutical formulation. The reactive layer can consist of a combustible metal or a metal capable of liberating energy by alloying with a metal of the bridge. Each of the first and second sections has a body portion and an end wall. The dual-channel wireless device may also comprise a second transceiver operative to communicate voice information over a voice channel using a circuit-switched network during the session.