The N10s are certified for IP68, which entails resistance to dirt, dust, and water. Please keep in mind that resistance doesn't equal proof. So you should not leave the device in any body of water indefinitely. Officially, IP68 has been tested for up to 1.5m depth and up to 30mins in water. Water damage is not covered under warranty.
The ip68 rating was tested under freshwater so I wouldn't dunk it under your pool or anything that contains salt. Also in the phone is water resistant not waterproof so the phone is susceptible to water damage