The carrier, not the end user,  for this phone number is Bandwidth.com

I called them to complain that  robo call's are being made from this number and they directed me to a link to their legal department to file a complaint.

here is that link for you:
http://bandwidth.com/resources/legal/policy_violations.html


I've also reported this to the FTC

This caller, has used different area code & number to call forfree  home  improvement, will be in our area today. According www.800notes.com, many people has filed complaints againt 213-915-3175 since 03/14/2013.today, I told the lady" Your comapny called many times. WWe are on do not call list.: I hung up & returned the call.essage:" It is not working number" as used to be.
07/22/2013. She called @ 11:20,AM.

Two more hangup calls today from this number, the second at  6:56 pm.

These idiots were calling me 3-4 times a day. Using my FIOS, I called forwarded these calls to another telemarketer number so now all they get is a message saying "this number is non-allocated". If you have this calling feature, use it, it works!

1:47 today - hangup call.