Recieved first call from an unknown number (*67 blocked i'm guessing?) at 6.23 pm, the same day at 7.25 pm i am called by 1-412-222-2222. In both cases i pick up say 'Hello?' twice into complete silence, and am hung up on. Both calls last 7 seconds. I tried to call back the many-2'd number but got a pre-recorded male voice after the first ring that told me my call could not be completed.