And I'm betting that you're not in your teens any longer or that you don't live in the Philippines either :)
Many factors determine how much people use text messaging. Among the factors are the age groups involved, how much voice calling costs as well as what's "right" for the situation. Many times the sending of a text message to someone who's tied up with something is a better fit for that person than actually making them stop what they are doing to have a telephone conversation with you at the moment.
According to