I use my phone for socializing, doing important stuff, and surfing the internet. Gaming comes once in a blue moon when I feel like wasting time, but I usually have YouTube and Twitch for that.
If you're going to look for a short time-waster, don't get games like Kingdom Hearts Unchained/Union/whatever-the-heck-it's-name-is-now X. I burned out of it after a couple months because I got tired of grinding to raise the level of my medals and trying to unlock more avatar boards while waiting for the next batch of story missions to come out. I felt like I had to put too much dedication, effort, and money into this mobile game in order to get the most out of it (though in truth, I only paid $15 once after caving in from the tedious grinding. Never again). I have since deleted the app, and I don't regret the decision, either, since it constantly demanded my attention.