Hoai, it's resistant to being in water, it's not waterproof, it's not even resistant to running water. The whole thing is a gimmick. If the phone gets a little wet because you're using it in a light rain, or you spill water on it and some runs onto the screen, you're okay. If you drop it into water or hold it under a faucet, there's nothing in IP67 that says it's protected. The words "under defined conditions of pressure" appear in the spec, but no one has defined the conditions for any phone. (IP68 means that even if water enters the phone, nothing will be damaged. I haven't found one yet.)