My wife got the same thing. I figured it was a phishing attempt, but called just to see who answered. It's a cheap automated system that asks for your account number and gives no other options.
Got this phishing text at 4:59pm on 10/14/09 --- CU West Alert: Your CARD starting with 485287 has been DEACTIVATED. Please contact us at 877-539-1561 to REACTIVATE.
I received two messages, one mentioned that my card was deactivated and I should call that number. But knowing that this is a scam, I wanted to know who they are, so I used a public phone and called, an answering machine said that it was disconnected. This morning at 5 am I received another text, the number began with 800 and the message was talking about community CU alert!