text message says H S B C aler,t call 1 438 338 1946. It is a SCAM

I have received HSBC text alerts too.  FRAUD!!!!  the numbers are 438-338-1946 (Montreal, Canada) and 917-470-9346 and 917-364-9393 and 917-292-7714 (All 917's are NYC cell phones and seem to be generated by Omnipoint.   Verizon blocked the several numbers from my phone and advised me to text reply STOP.  We'll see if it works.

received this message
          From 917-633-9646
                  (917)6339646)
          H.S.B.C-BANK
          ALERT PLEASE CALL +1(438)-338-1946
           CB: 917-633-9646

what is this all about?????