Remind me how this works
In countries[1] which don't have 100% mobile network coverage? Presumably, the worse the coverage, the further from centres of population and the more important that help be called, yet the less likely that the call can be made.
I'm also suspicious of any analysis which states 'x lives will be saved if...' - are there really so many accidents throughout the EU which happen without witnesses, most of whom are likely to be carrying phones anyway?
[1] e.g. the UK.