As the writer of the article I've some responses to the comments:
@MahatmaCoat
Vulnerable? Yes, these are people who get paid a few times a year and have to keep the money secure to live on it. How would you feel if you had your annual salary paid once a year and you had to keep it under your matress, with all your neighbours knowig it was there and no decent locks on the door? They currently lend the money to people just as insecure as themselves and hope to get it back. Turning it into virtual money is massively more secure.
@Phil Endecott
This is exactly the model for Wizzit, it's a virtual bank based on the bank of Athens, run in south Africa. The have vans which turn up in villages "The Wizz Kids" and operate the bank, then move on to the next village, much like a mobile library.
@Chris
Phones are typically charged from a car battery, they put the battery back into a truck and run it for a bit to charge it and then go back to charging phones.
Note: I'm not certain that Mckinsey are charging, or charging full whack ($2000/day when I last heard) but I think they would have mentioned it if they were not.
Simon