See
http://www.pdamobiz.com/show_news.asp?NewsID=97307&PN=1

Looks very useful. Just downloaded it to try out from here
http://www.mobiion.com/downloads.html

One reviewer has this to say:
"This product was an answer to my prayers. I purchased it for my PPC-6700 phone. It has come in handy because not only do I enable blocked call/txt from a particular individual, but I also can stop no number calls from others who are bugging me as well. I know now that when my phone rings/vibrates, its because the caller is someone I want to talk to. Excellent product"

good find !!! thumbs up !!

This thing supports two kinds of* & ? wildcards too.

Tested this software, very good man.
It can support wildcard call blocks, example it can block all calls from phone numbers that starts with 6256 by using wildcard 6256*

is this a freeware?