If you can't beat them, join them.

Tired of telling your students to put away their smart phones?  Then learn to make good use of them in your classes.
https://www.insidehighered.com/news/2015/06/08/study-examines-impact-texting-and-tweeting-academic-performance

My technique? Ask a question.  When they can't get it right, tell them to take their phones and look it up.  They love it.  And learning occurs.