Now, according to the WSJ, teachers are dealing with a consequence that nobody ever could have imagined when taking kids phones in order to provide a distraction-free learning environment: separation anxiety. 

Teachers across the US are comparing notes on what the best ways to manage this anxiety are. Some of them allow students to physically hold their phones in pouches that they can't open during class. Others let students charge their phones at stations in class instead of having to leave them alone in their lockers. 

Some teachers even offer extra credit to students for being able to part with their phones during class. 

South Bronx Early College Academy Charter School had to find a way to stop students from sneaking out of class to their locker to check their phones. They took the route of buying foamlike pouches that won't unlock without a special magnet. 

The school lets students decorate their pouches and personalize them to "make them as cool as humanly possible for something that's restricting them from their device," according to the school's principal, Brian Blough. 

Blough says students were "fiending" the first few weeks waiting to have their pouches unlocked after the school day. 

Other students tried to pry open and cut their pouches open. Eighth-grader Olamide Oladitan simply said: "It didn't work."

He eventually gave up on trying to figure out a way to open his pouch. "I didn't like it because I really wanted to get to my phone, but at the same time I didn't hate it because it helped me get better grades," he admitted, likely begrudgingly. 

YouTube eve shows some "hacks" to try and get the pouches open, including one video that shows people lighting the pouches on fire.