IPhone screen black with lines?

My phone screen is cracked and I assume water vapour got into it since it was in the bathroom during a shower. The screen turned black with lines after that when I tried to use it so I immediately turned it off and put it in rice. Is the phone completely broken and its a waste of time to put it in rice? How long should I leave it in rice if it should stay in there? It is not easy for me to get a new one so I'm really hoping to fix it.

Go to a repair shop. They'll fix it for you.

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