Whenever I want to study, I think about stopping playing with my mobile phone after 10 minutes of playing, but I always procrastinate, and then I play with my mobile phone until I go to sleep, without the energy to complete the task of the day, and then postpone it until the next day... 
Drop your Phone in Toilet Bowl , For sure you will stop Playing and will focus on your study.
That's the Only way you cans top addiction because there are tons of Youngsters now that getting addicted in Mobile games specially those Rank games.