@nprofile1q... I never answer my phone with "Hello", but with reciting my phone number. How they respond to that is a good indication of whether they are a legitimate caller or not; the ones following a script tend to get confused. I then repeat my phone number. The more confused they get, the more likely I am to just keep repeating it.
With legitimate callers, reciting my phone number is merely a confirmation that they called the correct phone number (and helps me memorise it, too).