[...60/1000 amp applied directly to the heart can do the job...]
You know they have home defibrilators now. Could you "McGuyver" someone with a telephone if they had a heart attack?
I am guessing that defribrilators are able to detect the heart rhythm and deliver the shock at just the right time. Else you might be switching it off instead of on! I expect a crank phone has enough BANG though. I suggest don't try this at home. Your lawyer, I'm sure, will agree! LOL