The maximum water resistance rating of the iPhone 12 series is IP68.
The rating means the phones are dust-tight and can withstand limited immersion in water under controlled laboratory conditions. Apple rated iPhone 12 models for depths of up to 6 meters (20 feet) for 30 minutes.
IP ratings come from the IEC 60529 standard. The first digit, 6, represents complete protection against dust; the second digit, 8, represents protection against prolonged immersion beyond the IPX7 level. That is why IP69 is not the correct choice: IP69 concerns powerful high-temperature water jets, not necessarily deeper immersion.
Water resistance is not the same as waterproofing. Seals can weaken through drops, repairs, aging, or exposure to chemicals, and Apple’s warranty does not cover liquid damage. The iPhone 12 series also improved durability with a Ceramic Shield front, but that protects against impact rather than water.