Mobile phones are not allowed anywhere on campus. You could be on a bus, at a cafeteria or even at the library but you will not be allowed to carry a mobile phone. Even if you are considering going around using a bike, it is prohibited.
The college authorities can conduct a surprise check. They have confiscated the mobile phones of various students and returned them once the final exams are done. It is quite horrible and of course, you will end up buying another phone later which is an added expense.
Usually, checking becomes less frequent in the second year as compared to the first year. But my advice to you would be to avoid getting a phone to campus at all. You will only get it back after you earn your degree.