I've received several calls now over the last two days. Due to the proliferation of telemarketing calls, I no longer answer calls from unknown callers, so I let these go to voicemail.  They never leave a message, but I've noticed they change their caller ID from one day to the next. Yesterday it was "VAILABU"; today it is "Out of area".  Doesn't matter to me what they call themselves; they are now blocked.  

I got one today from VAILABU and did not answer. No message was left. I had two calls from contractors yesterday on Moters Day which I did not answer. Incredible these crooks just never stop bothering people.

I don't answer when I don't recognize the number.  They hung up before the answering machine picked up.  Glad to have Caller I.D. on my phone!

Received 3 calls from 714 408-3719  over 4 days, left no messages

Telemarking calls on Sunday from these jerks. Otherwise they call once every few days, no matter whether we tell them 'no thanks' or we hang up right away. No respite. Maybe time to cancel landline service.
Soon they'll be calling middle of the night. Caller ID is "Una V."