At this point in time it's not really relevant to say cellphone vs no-cellphone. It's death by cellphone vs saved by cellphone ie, you need to compare how many

At this point in time it's not really relevant to say cellphone vs no-cellphone. It's death by cellphone vs saved by cellphone ie, you need to compare how many people have been able to call for help in an emergency, get a taxi rather than drink driving etc because they had access to a phone in their pocket. It's like comparing new drugs to the best off-patent generic, not a placebo sugar pill.