Anthropologists know there are three things most of us now carry with us wherever we go: our keys, our wallets and our cellphones. Digital wallets could fold the last two into a single item - and perhaps eradicate cash altogether. Could it change how we spend too?
A digital wallet is a chip inside your phone that uses wireless "near-field communications" technology. Pre-charged with money or able to request a sum from your bank later, the wallet hands over payment when you swipe it over a retailer's card reader. Cellphone users in Japan have used them for years, but the technology is only now emerging in a big way elsewhere. It is set to transform the payment industry, because mobile and web companies such as Apple, Nokia and Google are keen to rub shoulders with incumbents like Visa.
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