Not saying whether to buy from Amazon or not (we have gotten good stuff from them though) but use them at least for initial research of possibilities.
Here is a link showing their unlocked waterproof phones 5.5 inches and above -
https://www.amazon.com/s?k=waterproof+phone&i=mobile&rh=n%3A2335752011%2Cn%3A7072561011%2Cn%3A2407749011%2Cp_n_feature_seven_browse-bin%3A6215731011&dc&qid=1574710591&rnid=2335753011&ref=sr_nr_n_1
Also reading a tech site found more info on IP ratings -
IP What? What those IP ratings actually mean
When we talk about waterproof hardware, we often refer to an IP rating. This stands for Ingress Protection, and is usually followed by a number, which refers to its ability to withstand water and dust. The first digit relates to solid particle protection and the second digit to liquid.
All the phones on our list meet IP67 or IP68 standards. IP numbers that start with a six mean the device features complete protection from dust, and will ward off particles to the extent where none can find its way in. It’s the highest rating currently available, and is considered “dust tight.”
To meet the IPx8 standard, the device must continue to function normally after being left in water “continuously,” although the exact details are usually down to the manufacturer. For example, Samsung says the Galaxy S9 “can be immersed in 1.5 meters of water for up to 30 minutes.” Drop that down to an IP67 rating, and the depth changes to a meter, and protection is only for a short time.
Here’s a complete breakdown (
https://en.wikipedia.org/wiki/IP_Code ) of what all the IP codes mean, if you want to check out other ratings. It’s worth pointing out that while we call these phones waterproof, they remain so for a limited amount of time at best, and are technically water resistant. In other words, we don’t advise you to deliberately submerge any of them, especially not for very long, but it’s still nice not to have to worry if an accident happens.
The above is quoted from:
https://www.digitaltrends.com/mobile/best-waterproof-phones/