this phone number  keeps calling and leaves no mesage

Who is calling me?

I also got a call from this number, I didn't answer it since I was sleeping.
I live in Norway, so is this a american number?

Whatever, I don't care, I have no reason to call back on a american number. :)

I received a vm that gave me a verificaton number, but when I called back the number it was a busy signal.

wierd

Hi im received call from this no without any sms