The number leads back to something called predicto.com. I called both predicto and heycosmo and told them they contacted an secure internal government mobile phone and they were kind of scared when i threatened legal action.
Obviously hellocosmo.com or whoever is still up to their cell phone tricks even though other commenters say they were reported to FTC, since I got an unsolicited "missed call" with their phone number 302-336-7405 - no message left at 3:17 p.m. PST.
This number called my cell phone at 5:30 P.M. CST and appeared as a missed call. Tried calling back to find out who it was and to tell them "Do not call" again. Constant busy signal. Reported to Nat'l Do Not Call Registry.