you should limit mobile usage although there is not confirmed study yet but there have been controversies since a long time about the radiation of mobile.  so it's better to keep it to minimum also use earphones while on long talks . keep the mobile away from belly .

When not in use keep your wifi off, and don't keep your mobile next to you while sleeping.

Overuse of everything is harmful. Use it but in moderation

yes its harmful...do not use it excessively...

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