Everyday. I conduct business internationally through use of this. I conduct business in India, although I can talk to anyone in the world through that for just 5 cents each message through Voicestream. One of the only reasons i got Voicestream is because it is GSM.
Also, people in India use text messaging a lot more than we do in the states to send pictures, icons, love notes, etc. etc. yeah, they can just pick up and call but its cheaper and silent so they can do it in class, etc.
For me, its very important.