Phone netiquette to use a case for protection. Millennials, students, and worker phone owners of a certain type. Hard cover cases for expensive phones. Tablets with wireless calling. Large smartphones with mobile network operator services. Small expensive mobile phones. It follows, big devices are easily dropped. Takes time to replace broken electronics. We need phone service. Sometimes we cannot afford to replace expensive devices.
Use of a protective case for smartphones is necessary. Wherever we carry mobile devices. Use phone cases in transit. Taking phones out of our pockets. Using them while standing. Not so much at home.
First, safer computing is always advised. So, a case to carry big mobile helps. Protection provides freedom from harm. Next, saves us from a broken device. Then, a useful accessory many people need or want. Given, proper netiquette to use protection in principle.