When do you know that a technology has not only reached the main stream but that virtually everyone uses it? I think that stage is reached when not only kids are "doing it" but the 60+ generation as well.
Only a couple of years ago my mother was saying "yes, I have a mobile phone but I don't like it and it's only lying around at home and dust is settling on it". Now in 2009, she's sending me SMS messages on a regular basis and even admits that it is fun. (!?)
Why this change of heart I asked her? "Well", she said, "all my friends send me text messages these days, so I do it too now and it's great fun". Incredible, generation 60+ is using SMS now and they like it. And all of that despite the horrible user interface of a mobile phone, especially for people who keep insisting that the TV remote control is too complicated. I am amazed!