Keep your phone in a Bowl of rice for overnight. It will help you soak all the water vapour inside the lens, screen, etc.

Too much Pollution

It's because you have not specified which SIM you want to use for data and for calling.Go to settings, tap on Connections. Then tap on 'SIM card manager' and select the SIM you want to use for Mobile Data.And yes, only choose the sim which has a data...

Whatsapp uses video compression which decrease the video quality drastically. You can share the video file in document format.To do so, simply tap on the share option " " in WhatsApp and click on " ️" document. Select the video you want to share

If you're facing such issues, use device care in the settings