Calls to both my phone and my son's on a few different occasions.  Blocked on my son's (Galaxy), but I can't figure out how to on mine (LG droid).  Today, my phone rang and it showed as the name of one of my contacts/friends, but the call ended right after I answered.  I thought it was strange and I looked at my call history.  It showed her name, but this number under her name.  I'm concerned that my phone has been hacked.  I've changed my Google PW.  No idea yet if anything has been compromised.