The iPhone 11 Pro and iPhone 11 Pro Max are splash, water, and dust resistant as determined by laboratory testing. Apple has been making water-resistant phones since September 2016, starting with the iPhone 7 and iPhone 7 Plus which received a rating of IP67, meaning they are protected up to a maximum depth of 1 meter, for up to 30 minutes. Apple products are rated according to the International Protection (IP) rating as provided by the International Electrotechnical Commission (IEC). The water-resistant rating can be intimidating for a tech novice to understand, but it is not difficult to grasp once the different components are broken down.
The letters IP are followed by two numbers e.g. IP67. The first number after IP indicates a product's protection against solid objects like dust and sand - from 0 to 6 - and the second number indicates protection against liquids - from 0 to 8. The higher the number, the more protected the product is against solids or liquids. Therefore a rating of IP67 is a good rating and it means that the product has complete protection against dust and the effects of temporary immersion between 15cm - 1m and, up to 30 minutes. The iPhone SE, Apple's most affordable iPhone to date, received a rating of IP67.
When Apple tested the iPhone 11 Pro and iPhone 11 Pro Max under controlled laboratory conditions, both devices received an IEC rating of IP68 with a maximum depth of 4 meters, up to 30 minutes. As compared to previous models, this is a very good rating. However, the rating does not mean that the iPhone 11 Pro and iPhone 11 Pro Max are waterproof. Instead, it means that they are more protected against long periods of immersion under pressure. The resistance for non-permanent conditions may be reduced by wear and tear. The iPhone 11 Pro and iPhone 11 Pro Max are resistant to accidental spills from everyday beverages. That said, if an accidental spill occurs, rinse the area with tap water, and dry the iPhone by wiping it with a lint-free cloth.
How To Protect iPhone 11 Series
The worst thing a person can do is to intentionally submerge their iPhone 11 Pro or iPhone 11 Pro Max in water. Apple recommends that complete submersion is to be avoided, as well as water-related activities like swimming, bathing, showering or any other high-velocity water scenarios, and steaming. Other no-nos include exposing the iPhone 11 Pro and Pro Max to extremely hot, cold, or humid temperatures, dropping it, or disassembling it. Other liquids that should be kept away from the iPhone 11 Pro and Pro Max include detergents, oils, solvents; again if any of these fluids come in contact with the phone, simply rinse the area with tap water, and dry the iPhone by wiping it.
To remove excess fluid from the Lightning connector, tap the iPhone gently against your hand whilst the Lightning connector is faced down. You may use some airflow to dry the iPhone 11 series as long as it is not hot, like the air from a hairdryer. Direct the airflow to the Lightning connector for more effective drying. Never insert foreign objects into the Lightning connector in an attempt to speed up drying e.g. tissue paper, cotton swabs, etc. Apple also recommends waiting up to five hours before connecting anything to the Lightning connector, although wireless charging is possible if making sure the iPhone has been properly wiped down beforehand. Checking if fluid got into the microphone or speaker is as easy as placing the iPhone upside down on a lint-free cloth and seeing whether any water drips out. However, the main takeaway here is to remember that water-resistant does not mean waterproof, and this goes for all devices, not just Apple's iPhone 11 series.
Source: Apple