Guessing from your username you're a cadet. So, you're learning and that's a good thing.
In most of both my military career, and military contractor career, both before and after the advent of cell phones, there is/was no way to instantly contact me once my duty day began, other than getting in a vehicle and driving over to talk to me in person, or maybe using this antiquated thing called a radio (if I was within range).
Rather than relying on 24/7 instant contact, you future leaders need to be learning to plan in advance. There is absolutely no reason, other than poor planning, a cadet should not know the what, where, and when of tomorrow's schedule. Seriously, is a 2LT,going to wait until her unit has fallen in to mobilize before she decides to text motorpool to send a few trucks over?
We used to preach the 6 Ps (prior planning prevents pizz poor performance), and the flippant, but true "lack of planning on your part does not constitute an emergency on my part".
Finally, as you transition to the military, you will learn the evils of cell phones, fit bits, and other IOT devices. They tell the enemy all kinds of good things without your knowledge.
Not trying to be mean, just trying to show you we can do better than rely on cell phones and instant contact.
I agree, disciplined use would be great, but when the message bell chimes, you have to look at the thing before you know if it's a message from your CO, or an offer for some enhancement supplement of some sort. In either case, you are distracted.