When you have no cell reception.

[Fartrell Cluggins]

Most phones are waterproof, have been for several years.

They may be rated to a certain waterproof standard, whether they actually are or not is a different story. My fingers will not work on a wet screen and they won't work when cold either.

 

[Fartrell Cluggins]

I use a PLB for my boating, biking and hiking ventures. They work very well. https://billingsgazette.com/news/st...cle_73ae9622-f717-11ec-84fb-4799adc19fc9.html