iphone 7plus is waterproof

siabkhan ~ From the iPhone 7 Plus - Technical Specifications:

Splash, Water, and Dust Resistant

Rated IP67 (maximum depth of 1 meter up to 30 minutes) under IEC standard 60529

iPhone 7 and iPhone 7 Plus are splash, water, and dust resistant and were tested under controlled laboratory conditions with a rating of IP67 under IEC standard 60529 (maximum depth of 1 meter up to 30 minutes). Splash, water, and dust resistance are not permanent conditions and resistance might decrease as a result of normal wear. Do not attempt to charge a wet iPhone; refer to the user guide for cleaning and drying instructions. Liquid damage not covered under warranty.

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There is NO model of iPhone that is waterproof.

No, it is not water proof. See - About splash, water, and dust resistance of iPhone 7 and later - Apple Support

iPhone 7 and 7 Plus is water-resistant up to IP 67. Don‘t submerge your phone in water, it could still take damage.