The use of mobile phones while doing tasks which require high attention span, can affect the reaction time of the individual which can lead to serious and undesirable consequences, for example while driving. The present study was conducted on 82 young healthy volunteers, comprising 52 females and 30 males, to study the change in their auditory reaction time (ART) and visual reaction time (VRT) with the concomitant use of mobile phones. The mean age of the volunteers was 23.5 __ampersandsignplusmn; 5.75 years. The ART and VRT were measured using Audio Visual Reaction Time Machine, RTM 608. After recording the baseline reaction time when not using mobile phone, ART and VRT were measured when the subjects conversed on the mobile phone, in conventional hand held method and then later when they continued their conversation in the hands free mode. Results showed that the ART significantly increased from the baseline (p__ampersandsignlt;0.01) in both the above mentioned conditions (22.82% and 25.07% respectively), suggesting mental or cognitive distraction due to multitasking and the subjects took significantly longer time to respond to the auditory stimuli. The dual task performance, with both the modes of conversation yielded non significant difference (p= 0.705), suggesting that the use of mobile phone per se, whether in hands free or hand held mode, equally impaired the auditory reaction time .