In Asian culture, we tend to put our wet phones in a bag of rice (which was not recommended by Apple, by the way). Although modern iPhones have good water resistance ratings, it still takes a while to completely dry up.
However, some folks from The Verge and iFixit did some testing. According to their experiment, playing a certain YouTube video with low sound can vibrate the water out of the speakers below. To test it out, they used an older iPhone 13 in the water with UV dye, played the video and left it overnight.
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Why did they use UV dye? Well, it's so that they can truly see if the water gets flushed out entirely from the iPhone. Although the UV-dyed water was pushed out of the speaker grille area, there is still some left in other areas inside the iPhone when opened up. Besides the iPhone 13, they also tested on other phones from Google and Nokia. While playing the video, the water came out from the speaker successfully once again.
Using that YouTube video to pump the water out of the speakers is a neat idea, but since there is still some water left inside the device, we still recommend not to submerge any water-resistant device too many times. After all, there is a great difference between water-resistant and waterproofing. Apple doesn't cover any water damage either.
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