Who called from 9512929211

Called my cell & I did not answer. Left a message that said goodbye only.

Rec'd call. I answered and it just hung up.

I got a call from these guys.  Please do 'not' respond to these people.  It's a new scam going around to record your "yes"/"si" answers.  That recording allows them to get into phone systems from organizations that require voice verification to get into.

called my mobile #, i did not answer, and i have blocked this caller now.

Missed call from this number, didn't leave voicemail.