First of all, it is distracting because they just be sitting there on their phone and watching videos, playing music, and taking pictures. These teachers can’t compete for their attention so they can pass the grade they are in. Sometime when people be on their phones other people get distracted and they focus on what you doing and not the lesson that the teacher is teaching.
The bad thing about is when they are listening to music they fall asleep in class. When teachers is trying to ignore it, but they won’t put up their phones because everyone else is focused on you and what you are doing on the phone.
Second of all, the reason it is difficult to teach is because when you are teaching all you here is Youtube videos, Instagram, and Snapchat. These things can very annoying when you are trying to teach a class full of students that want to learn and do not want to be there. Sometimes in a classroom you see half of people paying attention and the other half on their phones talking to their friends while the teacher wants them to listen to what she/he is saying. This is important because that class might have a test and they do not know the answers they are going to fail that that test and even maybe fail that class.
Final of all, they can be cheating on their testing. Things about phones are that you can not see them when they are hidden. When a student cheat on their test they usually fail the test. When they cheat and they do not caught they can pass the test. Sometimes students cheat because they was not paying attention in that class and was on their phone, so most likely they will use it to cheat and get the answer for a test that they do not know. They have to