Why do people know how to sent or not text message?
Well I think that occurs because currently people don't know how to use the cell phones, all of this because those electronic devices evolve increasingly with new applications, or they have a lot of things that the users not even know. Other thing for tell you is that the old generations only use the cell phones like a tool of work and really they don't know what more things the cell phones have, although there are many people that know how to use these difficult tools.
On the other hand also exist people such as the youth that know perfectly how to use these devices and how to take advantage with them even up to the limits of using them for purposes not as ethical as when they copy their exams with their cell phones.
In conclusion, we can say that these devices have advantages and disadvantages, but these are a beneficial and useful invention for mankind.