Who called from 5102148704

Phone rang once and hung up before I could answer.

unsolicited call

Called me twice back to back phone rang one time each. I didn't answer or call back thanks to your warnings. One more to add to my blocked list.

Same here: barely rang once, then showed up as "missed call." Now it's going to be "blacklisted call."
Bleeping spammers.

Received a call - I answered and call was disconnected.  Received a call from a similar number 510-214-8706 two days ago... same thing.