Does this mean I should keep my phone on in class?

This is a classroom issue best addressed by your instructor. However, it is good cell phone etiquette to set your cell phone to vibrate to be respectful of others around you and avoid in class distractions

Safety and Prevention Tips

At Home Tip #5

Record the serial numbers of valuable objects you have in your room, home or office. Engrave such objects with your name or driver’s license number.