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.

Number appeared on call display but they did not leave a message. Assume advertising?

No one on the line.  Dead quiet

did not answer