I only have a couple of numbers in this blacklist but I think it's working good for me. I had that problem of not blocking any call after having introduced certain phone numbers but it was due to the 'correct' activation. Once you've entered some numbers, be aware that 'blocking' function is actually activated: press the title 'blocklist' on screen and be sure that 'blocklist enabled' is activated. In my opinion it should better if that function shows 'enabled/disabled' but it always shows 'enabled' and with some maemo themes it cannot be clear for the user if the function (button) is activated or not.
I only asked becasue of the endless threads I am finding requesting for such apps but no outcome
As mentioned by many others it would be nice to incorperate a number of features into one app, it would be nice to place numbers into categories for instance work, parents etc. after 17:00 and on weekends the phone would ignore all work related numbers both calls and sms's. Is a shame no app has these features.
Also, if call blocker is still in extras dev then why not just install call forward app and set it to busy?