Who called from 2106253159

Same here.  unknown number and no message was left.

Calls quite regularly. Have yet to answer, they have not left voicemail.

Called two days in a row. When called back immediately, receive message "sorry disconnected number". Answered and no sound is heard.

They just called me and i called them back and it said the samething.

They call about every other day. They never leave a message. When I call back it says the number is disconnected or doesn't ring.