unwanted phone calls (mobile)

[rigga]

Using a HTC one m7 on 3, lately the amount of unwanted withheld number phone calls is getting annoying, anyway of setting the phone to automatically block and prevent these coming through? Most are ppi claims company's or even just automated machine call's giving out much the same junk, also over the last 6 month's or so the number of number's I've had to manually add to my blocked list is crazy, why all of a sudden all these unwanted callers?

[rigga]

OK just registered my mobile number, but not sure this works that good, as during registration it was apparent that my home number was already registered with them, and we still get unwanted call's on that number too, also they say that after 28 days any unwanted calls can be complained about, but on my mobile my most hated ones are those that have no number attached, just say " unknown ", how the bloody hell can I complain about those.