Telemarketers are disruptive and call every day until they reach you. It's a nuisance I should be able to avoid by both (1) seeing who is calling and opting to ignore it and (2) being on an enforceable do not call list. The problem is made worse in that we carry our phones with us. At least with email we can send the unwanted email to spam folders or delete it or unsubscribe easily. We should be able to protect our phone space that way as well.