Why are people so addicted to their phones and text messaging?

Now days it is impossible to walk down the hallway without seeing at least one person texting someone else with their phone. It's even becoming a problem in class. If someone is trying to learn but the person next to them is texting their friend it becomes a battle of learning. It makes me want to yell when I see someone texting in class, I mean honestly, can't they wait until after class to talk to the person. It might be entertainment to them, but in all reality they're just distracting someone else from learning and it needs to be stopped. I know that the administration is trying hard to stop the problem, but people still do it. The real issue is the addiction people have to their phones though. If parents confiscate the phone the teenager goes crazy like part of their life has been taken away. So if we can get people to stop making their phones such a huge part of them, then we can have an easier time learning.