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 #2

Don’t leave exterior doors propped open. If you find one open, close it. At night, these doors are locked for your protection.