Hello godwin,

 It depends upon the midset of the staff and the management  of your college.You go and ask to your  principle or tutor or in your office .They will be returning  your phone with some warning or with fine or with some apology  letters or they will return your phone at end semester.sometimes they may also inform  to your parents so their is no other way better you ask apology and try to get your phone my friend 

                                                           Thank you