It is proper Netiquette to check it appropriately. Don't be a checker.
Many people constantly check their smartphones and the applications they enable. They are called checkers. This is distracting to those around you. It messes up the flow.
Go with the flow and check your smartphone when it requires attention or your need to use it for something. Be reasonable.
Check devices reasonably because it causes a distraction.
Published on May 16, 2015 | 0:38 Seconds | Science and Technology
An introduction to Smartphone Netiquette. Keywords, graphics, and symbols.
Published on February 14, 2012 | 1:12 Minutes | Science and Technology
The Rules of Smartphone Netiquette by David Chiles from a planet in the Cell Phone Cybershphere.