Who called from 2011830626

Number called me twice once at around 10am again seven days later at 8pm. First time I didn't get to phone in time, no message left; next time I answered over and over again saying Hello --no response then computer says..."Goodbye". Whats going on?

I got a call at 7:00 pm. No one there and call was not valid when I called back.

so annoying. calls 2 times a day. so annoying

Got a hang up from this number.

I keep getting these phone calls and I answer and there is no one there.  I tried calling from my hard line and it doesnt even ring.  This is so annoying!