Well the parents and teachers must work on every student so that they understand that their mobiles can ruin their life and they all of us can encourage them for playing outdoor games like cricket . 

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Please mark as brainliest if my answer is helpful.
You should tell your friend to avoid playing games in the Mobile. Because it disturbs the person physically. And playing with mobiles also causes stress to eyes which is very dangerous and harmfull. You can encourage your friend by asking him/her which game they like. Suppose if cricket show them few matches. Then may be they can start getting interest in it.
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Hope so this answer has helped u.