Blackberry smart phones are wildly popular – especially in business environments, but as is the case with any email account, Blackberry devices are prone to SPAM. The devices – as useful as they are – are prone to both SMS or Text Message and regular email SPAM.
Unfortunately, due to the nature of how the SMS protocol works, blocking SMS SPAM is quite difficult.Spammers will use automated systems to scan public websites looking specifically for phone numbers. They'll then start sending text message SPAM to those phone numbers. Since SMS messages are sent directly from your phone carrier (AT&T, Verizon, etc.) to your phone, there is no way to block them before arriving on your phone. This especially bad if you have to pay per text message received.
The biggest thing in combating SMS SPAM is to not get it in the first place. Never post your cell phone number to any public forum, website or social site. You can read more about SMS SPAM here: Text Messaging Spam – What is it?
The other vector for receiving SPAM is via the Blackberry email feature.