This study is intended to predict the effect of radio frequency waves of global mobile communication systems (GSM: Global system for mobile communication systems) on the calcium dependent chlorur channels of rat dorsal root ganglia neural cell membranes. For this purpose the spinal ganglia cells from 20 Wistar rats which were 2 days old and those prepared in culture media were used. The nerve cells were radiated by 10V/m electric field strength at 900 Mhz. from a distance of 5 cm for six minutes. Changes in cell current were recorded by patch clamp techniques. In the analysis of the records the applied radio frequency signal was not found to change the currents of calcium dependent chlorur channels and the membrane potential meaningfully. The analysis of recordings does not show any meaningful change in the currents of calcium dependent chlorur channels and the membrane potential of the spinal ganglia cells after exposure to a 900 Mhz radiofrequency field.