Stop saying Hello!

The other day a friend of mine answered her iPhone with a "hello?" No one does that anymore, especially the hello with the tone "who could this be?" She knew who it was. Everyone has caller ID now. I guess our generation that lived before caller ID is still having problems with just saying,"Tom, how are you?" or "Lisa, what's up?" We still feel that it is proper etiquette to open with Helllooo? Say good-bye to hello people.