What i am looking for is an application for an android phone that will do the following.
When an incoming call is received it checks against my phonebook.
If the incoming no is not in the phone book or withheld i want it not to ring or possibly to check the origin of the no, before playing a message of my chosing, hopefully something with delaying tactics to rack up their phone bill.
EDIT
Yes i have googled this but found no sensible answers, perhaps i am using the wrong search trms.