I too got a text from this same number, but they knew my name. Ironically, I also live in Texas, south of Houston. I tried calling it and it said it was a textPlus number.
http://www.andersoncooper.com/2012/05/16/bewa ... ity-theft-scam/
Tighten up the security on your accounts and don't click unknown links. If they've told you their Yahoo ID, report it to Yahoo abuse.