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A bank in every pocket? The idea that mobile phones bring economic benefits is now widely accepted. In places with bad roads, few trains and parlous land lines, they substitute for travel, allow price data to be distributed more quickly and easily, enable traders to reach wider markets and generally ease the business of doing business. Leonard Waverman of the London Business School has estimated that an extra ten mobile phones per 100 people in a typical developing country leads to an extra half a percentage point of growth in GDP1 per person. To realise the economic benefits of mobile phones, governments in such countries need to do away with state monopolies, issue new licences to allow rival operators to enter the market and slash taxes on handsets. With few exceptions (hallo, Ethiopia), they have done so, and mobile phones are now spreading fast, even in the poorest parts of the world. As mobile phones have spread, a new economic benefit is coming into view: using them for banking, and so improving access to financial services, not just telecoms networks. Pioneering m-banking2 projects in the Philippines, Kenya and South Africa show the way. These “branchless3 ” schemes typically allow customers to deposit and withdraw cash through a mobile operator's airtime-resale agents, and send money to other people via text messages that can be exchanged for cash by visiting an agent. Workers can then be paid by phone; taxi-drivers and delivery-drivers can accept payments without carrying cash around; money can be easily sent to friends and family. A popular use is to deposit money before making a long journey and then withdraw it at the other end, which is safer than carrying lots of cash. There is no need to set up a national network of branches or cash machines. M-banking schemes can be combined with microfinance loans, extending access to credit and enabling users to establish a credit history. Some schemes issue customers with debit cards linked to their m-banking accounts. All this has the potential to give the “unbanked” masses access to financial services, and bring them into the formal economy. What can governments do to foster m-banking? As with the spread of mobile phones themselves, a lot depends on putting the right regulations in place. They need to be tight enough to protect users and discourage money laundering, but open enough to allow new services to emerge. The existing banking model is both over- and under-protective, says Tim Lyman of the World Bank, because “it did not foresee the convergence of telecommunications and financial services.”