The Silicon Valley giant announced last week that it is pouring $4.5 billion into Jio Platforms, the mobile carrier-turned-tech juggernaut that has netted a slew of big investors this year. Some of that money will be used to develop a super cheap smartphone tailor-made for the local market — a device that could help Google and Jio capture some of the half a billion Indians who have yet to own their first smartphone, many in rural communities...