Who called from 6312010723

My phone identified it as a spam caller. No message.

Called my cell. No caller ID. No message left. Am blocking number.

Spam caller. No message.

Called my DNC registered cell. I don't pick up calls to my cell that aren't in contacts. No voicemail.
I used *67 to call back. "Press 9 to be put on the Do Not Call List."
BLOCKED!

Called my DNC registered cell. I don't pick up calls to my cell that aren't in contacts. No voicemail. Called the number from another phone. "Press 9 to be put on the Do Not Call List."
BLOCKED!