The central theme of that book is that people attribute dumb behaviors to things like chemical dependence, when in fact it's a behavioral habit. The classic example from the book is people trying to quit smoking. You kick the physical dependency in a few days - the headaches and irritability go away, but smokers still relapse months or years afterwards. Why? It's because the smoking formed a habit to their brain, and their brain associated good feelings with smoking.
Read the book. But if you don't: Your brain has trained you to feel good when you read the news. You break this habit by replacing the good feeling of reading the news with a good feeling from some other, positive, healthy activity. Example: every time you get a desire to pull out your phone, do 10 pushups instead. You get a little physical exercise, and your brain starts associating positive feelings with positive activities.
Also, why the hell do you have notifications turned on if you're worried about the phone or the news being addictive? It's like asking to have cravings amplified. Turn off badges, notifications, etc. Check it on your own time and terms.