Block SMS that does not provide a phone number?

[boutwell]

My wife is getting SMS spam. I guess her number must be in a DB somewhere from a previous user because she has only had this number for a few weeks and we are quite protective of our contact information.

On a quick search, I found BuzzOff and Callshield but the reviews for both of those apps for the Treo 650 were horrible. Is there a better way or must I try one of these two apps?

Thanks in advance for any help/ideas

Boutwell