Security systems for houses?

I keep storing all solicitor calls in my iPhone.  New member putting in the 70+ numbers I have stored (I use a really soft ringtone so we know we don't have to run for the phone).  I have answered this at one point and saved it as a hassle-call.  Don't know the caller, but it deserves to be logged.

ALSO if you get this same number with 011 country code in front of it, it is the same people using a call centre in INDIA to do their dirty work.  couple of these nasty numbers have 011 infront of the rest of the ten digits now.