BURLINGAME (CBS NEWS) — In their attachment to their smartphones, the students at Mercy High in Burlingame, California are typical teenagers. But when they enter Mr. Offield’s English class, the phones get locked into little bags, which can’t be opened until class is over.

“By separating something that’s primarily for their social life, I’m hoping that it brings them more in the moment,” Offield said.

Graham Dugoni is the founder of the startup company, Yondr, that makes the bags. He’s attempting to break cellphone addiction and “help people engage with each other in a real way.”