The Collaborative International Dictionary of English v.0.48:

Radiophone \Ra"di*o*phone\ (r[=a]"d[i^]*[-o]*f[=o]n), n. [Radio-
   + Gr. fwnh` sound.]
   1. (Physics) An apparatus for the production of sound by the
      action of luminous or thermal rays. It is essentially the
      same as the photophone.
      [1913 Webster]

   2. a telephone using radio waves, rather than wires, to
      convey the voice signal.
      [PJC]

WordNet (r) 3.0 (2006):

radiophone
    n 1: a telephone that communicates by radio waves rather than
         along cables [syn: radiotelephone, radiophone,
         wireless telephone]