How to convince your friend that he got Schizophrenia instead of being hacked?

One of my classmates continuously sends me some screenshots which he believes is the proof of his phone being hacked, and he insists that his life is under surveillance by a hacker. I have looked through those screenshots and his phone and it turns out nothing wrong. From his way of talk and facial expression I suppose that he got Schizophrenia and got a victimization delusion. How should I convince him to go to the hospital?

(not a native speaker so plz correct my choice of words if wrong.)

Thank you for your reply.
In fact I have tried to do this for a couple of days, but it seems like he is unwilling to analyze the result and insists his opinion. Maybe I should communicate with his parents about this issue.

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