Spam Moves to Cellphones and Gets More Invasive This statement really stood out at me: The volume of spam on the SMS network that is blocked at the server level and never appears to customers is much higher than I thought! The amount of spam I actually receive in my SMS inbox seems to be about 1-2 per month on average. Although perhaps it is seasonal -- I haven't gotten any that I can recall since I got my iPhone, on the same account as my Blackberry, and I had definitely been receiving a few every month when I had my BB.... Neither device has a spam filter, as far as I can tell, at the client level. Perhaps the Blackberry's BIS bypassed T-Mobile's corporate spamblocker and used less aggressive settings?