The thing about modern phones is that they're very sophisticated. Yet, with sophistication comes frailty, and boy, oh boy, are our modern phones both sophisticated and frail. Seriously, these things can go berserk if a tiny drop of water hits them in the wrong place. And that's why we recommend having a container filled with rice stored and ready to go for any phone emergency, just like this grandma does.
If your phone ever gets a little too wet for its own good, just stick it in a bowl of rice (or alternatively: salt). This little trick may just save your phone!