Who called from 2609013236

Received a phone call from this number. No voice message left.

Got a call from this number. Did not answer, no message left.  I don't see anything showing up on quick internet search.

Just got a call from this number, did not answer. They did not leave a message as usual its not the first time I've received a call from this number

Same here.  No message left.  Robo call I'm thinking.

answered. said "this is not a valid extension, please try again." this is a robo call seeing if numbers are real.