Background : Mobile phone use is increased worldwide, most of mobile phone users are from the 
young age, Our study is carried out to explore negative effects of mobile phone radiofrequency 
(MPRF) on IQ grades of the children. Methods: our study is a (case-control) pilot study on 30 
children as users (cases) 12-18 years old, and 30 age matched nonusers (controls). We used Stanford 
Binet intelligence scale for assessment of the IQ and its grades. Results: there were significant 
differences between nonusers and users in the full scale IQ p=0.02, grading of the full scale IQ 
p=0.01, nonverbal IQ p=0.03, and verbal IQ p=0.01, but no significant differences in the distribution 
of grades between non users and users. Conclusions: We found negative effects of MPRF on IQ
distribution between MP non users and users which predict harmful effects in the teens who are 
frequently using mobile phones for calling.