  Lead-halide perovskites are promising materials for opto-electronic
applications. Recent reports indicated that their mechanical and electronic
properties are strongly affected by the lattice vibrations. Herein we report
far-infrared spectroscopy measurements of CH$_{3}$NH$_{3}$Pb(I/Br/Cl)$_{3}$
thin films and single crystals at room temperature and a detailed quantitative
analysis of the spectra. We find strong broadening and anharmonicity of the
lattice vibrations for all three halide perovskites, which indicates dynamic
disorder of the lead-halide cage at room temperature. We determine the
frequencies of the transversal and longitudinal optical phonons, and use them
to calculate, via appropriate models, the static dielectric constants, polaron
masses, electron-phonon coupling constants, and upper limits for the
phonon-scattering limited charge carrier mobilities. Within the limitations of
the model used, we can place an upper limit of 200$\,$cm$^{2}$V$^{-1}$s$^{-1}$
for the room temperature charge carrier mobility in MAPbI$_{3}$ single
crystals. Our findings are important for the basic understanding of charge
transport processes and mechanical properties in metal halide perovskites.
