[Someone]

Even then, 40% of _households_ does not have a phone (http://www.nydailynews.com/life-style/health/indian-toilet-s...). That is in line with http://en.wikipedia.org/wiki/List_of_countries_by_number_of_..., which states there are about 2 mobile phones for every 3 Indians.

I think it is safe to bet that, among those using public transport, mobile phone ownership will not be higher. Also, of those with a mobile on those buses, mobile phone _usage_, likely, will be higher for the richer ones.