Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
yea, same here. Just checking though, I've done the process too many times and I've got so much stuff loaded on my phone now I don't wanna deal with that
 
To answer the question, yes you are just as vulnerable as AT&T users. Regardless of your service provider, the SMS app had a bug in it. Whether you consider this a serious threat or not is up to you. I don't really, but I upgraded anyway.

My GF on tmobile is still using 2.2.1 with her 2G iPhone.
 
I did upgrade, because I think that now the details are released, some bad guys will start working on this. The security conference reckoned a couple of weeks before we start seeing the first exploits.

It might be for mischief (eg knock your phone off the network), it might be for money (secret calls to premium line numbers), or to steal information. Who knows. But people will try.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.