They called my very private cellphone at 1:18 PM PST on 10 February 2016. The caller ID said "Bakersfield, CA". I did not answer. They did not leave a message. My phone numbers are on the Do Not Call list.

I called them back the next day from a blocked phone. A voice said "invalid pager" and then hung up.

They are just another scammer.  I will report them to DoNotCall.gov.