I was getting some weird stuff when I switched from a RAZR2 to my BB 8820. The text messages were MEdia Net "tips and tricks" and geared for the Moto phone. I changed My Device on My AT&T page from the RAZR2 to the 8820 and most of the gibberish stopped. One last thing I had to do was use my old RAZR to open the MEdia Net mobile mail app and delete the hotmail account from my listed accounts. I made sure there were no accounts listed. I was getting notifications of new inbox mail from that hotmail account and the only way to kill it was through the RAZR.
when I first got my 8330, I was getting them 6-8 times a day for the first few days. they stopped on their own after a few days. I stopped opening them after the first day.