The question is why it hasn't happened sooner. This thing in your pocket is not just your telephone, but also your watch, map, calendar, contact book, music player, library, and so on. It can't be long before it's also your passport and your wallet.

These are things that had a life as separate items in days of yore and separate websites not long ago. They're also things that naturally lend themselves to the format of a phone.

You'd have thought the mobile wallet would have been the first thing on the minds of the big platform companies.