Just got a call from this number. It sounded like someone listened for about 5 seconds, then hung up. I really appreciate this site, it takes so much anxiety out of these strange calls!!
I've gotten 15 calls from them in the last 3 days. They are calling more and more frequently - hourly now! I don't pick up. Will follow steps you outlined.
Someone called my cell from this number and said nothing. I stayed on the line at least 10 seconds, waiting for someone to say something. Then I hung up.
Be careful with this number, I checked twice and it went straight to Skype.
They never leave a message on the phone. It's disturbing to say the least!!