There were a few days about a year ago (on my BB), I was receiving two bank-phishing-scam SMS on the hour every hour, day and night. I received close to a hundred in about 4 days, and I was on a 400/mo plan at the time.
Obviously, STOP didn't work in this case.
T-mobile was absolutely no help when I called them. They suggested I cancel messaging altogether or change my number. (isn't that some crazy ****?)
With a little of my own investigation though, I found that the messages originated from an email address and were merely delivered to me via SMS. With no help from TMO, I was finally able to filter the t-mobile email for that phone (not the BB email, just the email@example.com address). That appeared to fix the problem with no ill-effects.
Had the SMSs been delivered fully through SMS protocol, I would have been hosed.
I was irate through all of this. I still can't believe there is no way to filter out malicious SMSs at the carrier. I could block it at the phone, but TMO still would have happily charged me for the extra 1500 messages.
I hate SMS, but we're stuck with it until the dumb-phones are eradicated from the planet.
I'm still getting these damn things and keep replying STOP. It's usually only a few every other day but it's still annoying as hell. I just got one a few minutes ago.
It really makes me wonder if it is somehow linked to a sprint email associated with my phone. When I was on Verizon (with the same number) for YEARS I never got a single SMS spam (that I recall). After being on Sprint for 2 months this started.
I know Verizon had a similar email/phone setup where someone could email 555<thenumber>@vzw.com (or something like that) and you'd receive it as a text.