There is nothing preventing them from providing users with more granular call-rejection controls. Their networks need to be "accessible" on the incoming call s

There is nothing preventing them from providing users with more granular call-rejection controls. Their networks need to be "accessible" on the incoming call side, but that does not mean as a customer I should be forced to have every call intended for my number to be routed through to my phone. An iptables concept with a user friendly UI would address much of this problem, particularly if we could filter on useful call origination data, or lack thereof.