[truncj]

This sounds like a persuasive essay just lists facts without researching the benefit/detriment of each.

Taking a picture of a whiteboard is not the same as writing/typing notes.. and no, teacher's don't have the luxury of failing kids due to ignoring phone rules (unfortunately).

[TremendousJudge]

there are few things as useless as taking a picture of the whiteboard

[cube2222]

Your mileage may vary. Sometimes I like to write everything down, number by number, symbol by symbol, but oftentimes I prefer to talk to the teacher about what he's writing to understand it better but keep it for future reference.

Writing down aids memory, but not understanding in my experience.

In complex topics like discrete mathematics it's been a lifesaver to me.