Who called from 7749079221

This phone dialer has been bothering me for months!  How do I get rid of them?  maybe a call to the State Attorney General's Office, first and then file a complaint with the FCC.  Yep, that's what I'm doing..tired of this crap!

Get up to answer phone, but it has gone into answering machine mode.  Call took up time but left no message.  Very annoying.

Caller never speaks and after 10 seconds the phone disconnects.

Calls from this number come to my cell phone. No one is ever on the other line!

This number 774-907-9221 as well as 702-576-0450 consistently phone ->  nobody speaks and then hang-up.