Hey I'm a texter...
I don't know I go through like 100 a week but i usually just do it to pass time through classes other times its a mass text message to see who wants to hit up a movie... calling 15 people blows but just adding 15 people from a contact list and typing out 1 message really is much easier.
i usually call for more important things though and I never text someone when I'm talking with someone in person... I also usually ignore my fone for that matter seems more rude to stop a conversation to take a call then to call that person back in a couple of minutes