It's just called text messaging in OS6. If you send just text, that is SMS over the voice network. If you attach a file such as a pic or contact then it will be MMS over the data network.
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how do you select a pre-existent picture? I understand how to send them but I have to hit attach and then take the picture and send it. cannot I not send a picture taken prior to wanting to send?
Just go to media > pictures and select the picture you want, press the bb button and select send. This should give you multiple options including to send it via Text message