Having phone has become an essential need of people in present time. Using phone excessively produces several psychological and physical problems in users which have been investigated by psychologists and physical health specialists. Therefore, we conducted the present study to compare the addiction of simple phone and smart phone in youths and find out the effect of phone addiction on users’ mental health. Sample of 300 post graduate students was selected through purposive random sampling technique from colleges of Aligarh. The sample was categorized into two groups – smart phone users and simple phone users. Data was collected by administrating Smart Phone Addiction Scale-SV, Mobile Phone Problem Use Scale and Mental Health Checklist. Results indicated that smart phone users have higher addiction than simple phone users. Excessive phone addiction was also found associated with poor mental health.