5. Turn off (or customize) notifications
You don't need an obtrusive bleep or buzz every time your bar mitzvah #TBT gets some love. It only makes you more apt to whip out your phone and get nose-deep in a vicious tech circle of texting, email checking, and lord knows what else. You can disable in-app notifications in your main settings menu (under the App section), or customize them for only the important stuff. As far as calls and texts go, one viable solution I've been using is setting custom vibrations for certain people. So, I can tell if it's someone important (like my girlfriend, or the neighborhood dog catcher) without taking my phone out of my pocket. You can make your own custom vibes by selecting a contact, then the "Vibration" option, underneath "Ringtone."
6. Airplane mode will set you free
This is another answer for people too scared to leave their phones behind completely. Basically, you'll be left with just a combination clock/camera. If you really want to focus on a task at hand, or just need to make sure no one bothers you for an extended period, just switch on airplane mode, and let it ride. Try doing this while you're driving, in social situations, or watching TV, and gradually extend your "Airplane time" to other activities. It's all about conditioning yourself to a life less cluttered with phone time, and Airplane mode is an excellent stepping stone on your way to mindfulness.