Is your phone waterproof? Can you take your iPhone swimming? Here's what those water-resistance ratings really mean.

If you rely on the dictionary definition of waterproof ... For that reason, the IP rating system was developed by the International Electrotechnical Commission. IP stands for "ingress protection ...

Sometimes you'll see an IP rating with a number replaced with an X, such as IPX8. In this instance, a company hasn't provided testing details so the rating number is replaced with an X.