Rice is for eating
Where did this fairy tale come from? Perhaps it is a practical joke because it doesn't reflect anything that an electronic engineering course would support (and more than likely denounce). That is putting your
cell phone in rice to get the moisture out.
When your comes in contact with moisture (there was even an episode on Shark Tank that covered this) time is critical. The sooner the moisture is out, the better chance you have of saving
your electronic devices. While this site doesn't assume your device can handle water in the first place (as other posts reflect) it is best to keep it out of the water unless it is in an approved underwater container.
Accidents do happen and because many batteries are sealed (making it difficult to take the backs off to remove the battery to dry off the components, it is even more of a waste of time (with respect to time) to assume this fable works.
As previous posts on this site have stated, if your phone lands in a hot tub or pool with chemicals, those chemicals are corrosive to your phone that isn't reversible. Your phone can turn into a crystal garden as well as a hazardous material concern.
Even the ocean or pools with salt water have the same affect on your phone as well and the other components in your phone aren't good for the sea life to be around. If you are in a fresh water lake, you have a
better chance of saving it.
Use a duster can instead
Duster cans are great for cleaning dust out of computers and cameras (I still use digital cameras that aren't part of the phone). The chemicals in the cans immediately evaporate moisture on contact as well.
The faster you can apply one to you phone, the chances are better that you can save it
They may be behind the drugstore counter for a reason but this can can rehabilitate your phone quickly.
Why your phone isn't "water proof"
One of the differences I have observed between Apple and Android devices is the differences in the charger ports. The lighting ports may have an easier access to getting moisture in from the opening in the port on Iphones than USB C devices (used on most
Android devices today) because of how the connections are enclosed and attached to the motherboard with less of an opening from the outside case. This is why some USB ports on portable electronics have a rubber enclosure that goes over the port (such as headphones) and can do a better job at keeping moisture out.
Regardless of what phone you do have, moisture can get into headphone jacks, speakers and microphone openings, and devices that have cracks that haven't been repaired.
These are the reasons why many smart phones focus on water resistance rather then water proof.