save record of texts automatically? is it possible?

my T-Mobile phone (SGH-639) has text message center options. i looked at the options for the default and it was T-Mobiles center number ( +12063130004 ) and i can put three more in, but only choose one. and i can't add the + to the beginning, but i can input a 20 digit long number. i've been trying to figure out if i can use that to have my messages sent and received go to another center, and then my phone and be saved at the center to keep a record of just in case my GF wants to say i did something i didn't. is there any place/program/ or way to do this?
 
sad I’m confused
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