Hi there,

Yes,mobiles are allowed in hostel. As now you live in hostel so you need to connect with your family. That's why it can't be prohibited to use phones in hostel. Furthermore, most of class group of colleges are made on whatsapp. Schedule of class is sent on whatsapp group. Teacher informs about most of news to students through whatsapp. That's why phone is an essential part of student's college life and it is allowed in hostel.

Hope it helps you

Good luck!