Dear,

Kindly, mention which college are you talking about. The student does not have the right to use a mobile phone in a college or school. Most engineering colleges ban usage of mobile phones inside their academic premises. It is a rule to be followed by all students in the campus. You can carry mobile phones for your safety but make sure you don't use it when you are in the campus. For any emergencies you can always use the college office phones with required permission.

Hope this helps!