I have a personal phone that is dedicated to gaming. I do this so as not to disturb my workflow because one, it would run out of storage and memory, two, the notifications would be crazy disruptive. These days it doesn't just take good eye hand coordination to win games, but noticeably these past few months made me realize that there's a whole lot of things can help you get ahead of the pack.
A Good Controller
There are tons out there which you can connect through Bluetooth but choose the one that doesn't do ghosting, have ill replaced buttons, or could barely catch up with your movements. Get one that's compatible, used by pros but one that you can afford of course.
These days, an ordinary headphone just won't cut it. It has to have audio quality that will bring you the actual game experience, beat background noise, powerful enough that you can hear footsteps of nearby enemies which is vital for any game. You have to find something good.
Gaming seriously? You've got to consider having finger sleeves. The slide of your hand to the next button could mean several kills in a game but if your enemy is the screen and how it skids on you, a finger sleeve is definitely an answer.
A Good Phone
If you've suffered enough and your stats are not showing improvement, you might not be the problem. The problem might lie in the phone you use. There are phones that have built in stabilization, like the vivo Y31’s Multi-Turbo 4.0. It lessens lag and performance issues as it has a Qualcomm® Snapdragon™ 662 octa-core processor and with 8 GB RAM and 128 GB ROM. That's more than enough for your high performance games and storage needed for it to work. You can get more information about the vivo Y31 here http://www.vivoglobal.ph/phone/vivo-Y31 or just head on to Shopee or Lazada as they've got several phones that you could fancy.
Take your gaming seriously.