I wonder how many non-English speaking countries adopted hello as the default phone greeting. In Russian "allo" is used, which is pretty clearly traced to Edison's hello.

On the other hand, my US-born teenage kids don't seem to be continuing this grand tradition, presumably due to most peer communication happening over text. When called, they just pick up the phone and wait for the caller to speak first. If I stay silent as well, I get an annoyed "yes?" eventually. My lessons in phone etiquette have gone unheeded.