CallFirewall

CallFirewall basically rejects unwanted calls.

Features & Options:

a. Accecpt all calls - pretty self explainatory
b. Accept call from My Contacts only - accepts calls from contacts only, others are rejected
c. Reject all calls - pretty self explainatory
d. White List - accepts calls only from the white listed nos
e. Black List - accepts all call except from the black listed nos
f. Black List Pattern - any no STARTING from the black list pattern list is rejected.
for eg. if you enter "123", so all nos STARTING from "123" will be rejected
this is a very nice option with which you can block nos from any particular network, country, city , area or whatever you can think of.


Finally there is also an option to reply with an SMS.

XDA-DEVELOPERS