Does Mobile will bring you Future good? the thing is Study is your future then decide .. Do you want your future be good , fo you want your present be for?
I always keep saying those to my Son and i believe that this will also good for you OP.
Make yourself work harder, more self-disciplined, don't let yourself be lazy, only if you indulge yourself will make mistakes again and again.
He is Student and he has no work still lol.