While some of mobile phones get close to being labeled waterproof, we probably should treat them as just resistant to water.
When we talk about waterproof hardware, we often refer to an IP rating. This stands for Ingress Protection, and is usually followed by a number, which refers to its ability to withstand water and dust.
If the IP number starts with a six, then the device features complete protection from dust, and must ward off particles to the extent where none can find their way in. If the number is a five, like the IP55/IP58, then the phone is protected against ingress, and any particles that do get inside won’t stop it from working.
There are only to major phone manufacturers offering water and dust proof mobile phones: Sony and Samsung. Once again, they don’t really guarantee your phone to go under water or they only allow it within the first year of manufacturer’s warranty.
When it comes to your device being repaired outside the warranty, it is very difficult or almost impossible to get it waterproof again. Here in Raphone, we use original parts but we don’t recommend you to use your Sony or Samsung phone in a water anymore.