Who called from 3209902987

Get phone calls on my cell from numbers like this every once in a while.
They never leave a message.

no message. calls every day

I got this call on my cellphone and I did not recognize the number so I ignored it.  I later called it back and it asked for you fax ID number.

Received call... asked to stay on the line for operator. Not available at this time. Hard to tell what it's about ... we have so many employees... can't give information about employees without a signed release