The new iPhone 7 and 7 Plus are IP 67 water resistant; however, this does NOT mean they are waterproof. There is a difference here. What does this mean? Your precious new iPhone can still get water damage if you’re “testing” it’s resistance to water.
What is ok? Splashes, rain, accidental spills into a shallow depth of water and getting it out quickly. What isn’t ok? Submerging your device for 30 minutes to an hour in an attempt to show how resistant to water it is. These are $700 and above prices devices, treat them as investments, especially when the new devices are hard to come by in these early weeks after the release.
Bottom line: The iPhone’s IP 67 rating is there to protect the device and your investment, water damage can still occur on the device and can be detected by Apple, so be careful and don’t put your shiny new device in harms way because you want to “test” it’s resistance.