Green and red buttons have been on nearly every cell phone that I have ever owned–even the 20 lb. brick in the 90s. I have never quite understood the people who use the green button when they should use the red. “Hello-what-do-you-need-I’m-kind-of-busy” rolls swiftly off their tongue in a hushed voice as if to say ‘you should be thankful that I stopped what I am doing to answer your call but not so important that I am actually going to give you the respect of talking in a normal tone or speed‘ and maybe a little ‘I want you to know that I am busy and have a life, which is the reason that I answered the phone in the first place.’ Spare us all from your bullshit; please use the red button.