[Xperia Z4/Z3+ Q&A, Help & Troubleshooting] rdosti:
an3k is absolutely wrong. In fact he is perhaps even mis guiding you (probably is the one with no real idea!!) to perhaps doom for your very expensive phone. Perhaps even trying to market some app to fool people in using something and messing their systems up!

http://support.sonymobile.com/in/dm/waterproof/

Go there and explore. Clearly mentions not to "fully submerge" device (bottom of the site) as it will void all warranty. It very clearly mentions do not use it unless on standby as that was the only way it passed their test!

From the Sony website (Basic Care section) :

1. "The IP rating of your device was achieved in laboratory conditions in standby mode, so you should not use the device underwater, such as taking pictures. Do not use the device to take photos while performing any type of activity underwater, including diving or snorkeling."

2. "Do not expose the device to seawater, salt water, chlorinated water or liquids such as fruit drinks, liquid detergent and vinegar."

--- So there goes any thought of using it in chlorinated water too.

3. Warranty, repairs and customer service

It’s important to know that your warranty does not cover damage or defects caused by abuse or improper use of your device. Also note that compatible accessories, including batteries, chargers, hands-free devices, keyboards and micro USB cables, are not waterproof and dust protected on their own.

4. If the device is "accidentally" exposed to non-fresh water, such as chlorinated water from a swimming pool, always rinse your device off using fresh water.

Notice: Accidentally and not "On Purpose".

All four points themselves make it very clear not to use the phone active mode (including camera footage, etc) under water in any kind of water. It is to be used only for "partial water footage" which means you should not "fully submerge it". You can take photos while you are in the pool but should not "submerge the camera" under water.

I have no idea why the previous poster is trying to sell a story (or an app) and saying that I'm wrong when he is completely off track.

I have personally even had calls this week with the Sony Support service in India (which by the way is more reliable than the one in the USA or Europe as people have also complained about having limited knowledge). Perhaps the previous poster and anyone else with a query should just glance at Sony's website regarding the same.

From the website again:

From the Website (refer to the last point)

"Taking photos and movies in wet surroundings. Remember not to use the device underwater. If you accidentally get the device wet with non-fresh water, wash the device with tap water."

Again all you need to know is clearly and publicly available on their website.

http://support.sonymobile.com/in/dm/waterproof/

Never ever attempt to do anything unless you know for sure it is covered under warranty as "an3k" is not going to pay for anyone's damaged phone or offer a replacement.

And if you want more information head on over to the Z3 Forum and see for yourself what people have said and their nightmares with underwater recording.

Have no idea why people disrespect other members or misguide users!

Anyways....