My son is presently performing bad, he is presently very much addicted with cell phones, how can I motivate to go with right path? He is presently has very less interest to study with full concentration; what may be the cause and what is the remedy? Presently his friend's circle is affecting badly.

Firstly my advice would be treat this as sensitive one. Not sure what is his age? But generally speaking - anyone will take advise from others only when there is a mutual admiration, respect and trust in place. Set aside few hours to spend time with your son - and work on some areas where you both g