iPhone X is splash, water and dust resistant and tested under controlled laboratory conditions to an IP67 rating under the IEC 60529 standard. Splash-proof, water-proof, and dust-proof functions are not permanently effective, and the protective performance may decrease due to daily wear and tear. If you get into the water for a short time, it should be fine if you take it out as soon as possible. If you find any abnormality, you should shut it down as soon as possible and send it for repair.