The influence of GSM phone on electroencephalogram is still at the stage of study [1-3]. Significantly, it is caused by difficulties and inability to record a clear EEG during usage of this type of telephone by the patient. Therefore for evaluation of such influence data that was received either using the unmodulated signal generator or by the researching residual effects after turning of cellular phone are used very often. The both of this approaches do not describe the real influence of modulated high frequency signal in EEG in real time and that is why they can be used only for initial estimation of such influence.
