(408) 317-4737.. called 6 times in 2 day. When i called back, that number is not reachable.
I blocked the number. (on samsung phone, you can find block function in "More" when u have this phone in call log selected.)
I received more than 15 calls from this phone number in last 3 days. When I answered, it was silent for a moment. Then, there is a "Ding" and a "Goodbye". It is very annoying!