[Question] Call & SMS Blocker problem

Nov 8, 2012
Hello guys...
My Desire S running MIUI v 2.12.21 IMM76D.
My question is why SMS and call blocker doesn't work?
When I block a phone number with Guard app that come with the ROM call / sms from phone number that blocked still come in. I try block with call & sms filter in avast! Mobile Security doesn't work too...
What should I do to solve this problem?
Thank you.

(Sorry for my bad English)

Sent from my droid hTC Saga