So the question is, what is the "mission" he is handing out? I suspect they have no control over what lists of phone numbers they are given to call. I did this GOTV in Ohio back in 2002 and 2004 before relocating to Texas in 2005. At that time, we worked from a central office in Cuyahoga or Medina County.
They can now call from home. I'm guessing they'd call people, say they're from the GOP, the folks will believe them because they had to get their number SOMEHOW, and they'd say or do something to try to get the person to either not show up to vote, or to turn against the GOP. It's a simple and dirty strategy.
They can just throw out the phone numbers, not call them, and not walk the streets, so however many names they get, those don't get encouraged to go out and vote -- at the very least.
Or they could call them and say things to make them mad at the GOP, such as pretending to be a GOP caller and insult them.