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That led through feasibility to successful pilot, to this gigantic system that you see now, which is utterly stunning. The way it works is this: When you get a phone that has M-Pesa, you basically have an extra menu in your phone, which says, “Send money.” If I wanted to send you some money, I would choose the menu on my phone which says, “Brett”; I put in the amount of money I want to send; I put in a PIN; I hit “okay”; and then you get a message on your phone. It looks like I’ve texted the money to you, but that’s not quite what’s happening under the hood. The text message is going to a central server, which moves the money from one pot to another pot within the M-Pesa central account, and then it sends you a text message. But, to the customer, it looks like the money’s gone from one phone to another by text.
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Brett King (Breaking Banks: The Innovators, Rogues, and Strategists Rebooting Banking)