Called me at 5:27 p.m local (2327 GMT). I didn't pick up and the caller didn't leave a voicemail.
I sent a text back verbatim "Don't know you. Not picking up", then got an immediate automated reply from number +1 121-611-611 stating: "17322304139 Error Invalid Number. Please re-send using a valid 10 digit mobile number or valid short code. Don't know you. Not picking up."