These waterproof pouches worked great to protect our phones from water. We didn't try submerging the phones but they are also fantastic to keep damaging sand away from the phone while at the beach, all while still allowing you to use the phone.
We were able to use all functions on our iPhones and take pictures while the phones were in the pouches too. In some pics you can tell the phone was behind a clear barrier but most looked perfect. I'll have to play with it more to figure out why there was glare in some cases.
While we did not submerge them with a phone inside, I did put paper in one and submerge it and the paper stayed dry so they seem to work.
The four pack was very convenient for us, so there is always one available. The colors look nice too. The long necklace made the phone easy to find in a beach bag. All in all these provide good protection and peace of mind.