Google is rolling out its Google Wallet across all Android-operated Sprint Nexus S 4G phones to allow consumers to pay using their handsets.
Mobile wallets use near field communications (NFC), which allows consumers to tap and pay using a PIN number in the same way as credit cards. The Sprint Nexus S 4G contains an NFC chip to enable this form of payment and the transmission of coupons or loyalty cards.
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In May, Google announced that it was testing its Google Wallet app with Citi, MasterCard, Sprint and First Data.
Google Wallet enables customers to pay with a Citi MasterCard credit card and the Google Prepaid Card, which can be funded from other credit cards.
Visa, Discover and American Express have also made available NFC specifications, which could enable their cards to be added to future versions of Google Wallet.
"Our goal is to make it possible for you to add all of your payment cards to Google Wallet, so you can say goodbye to even the biggest traditional wallets," wrote Osama Bedier, vice-president of payments on Google's blog.
Google's pre-paid card will work internationally at launch and can be used at around 300,000 shops and other outlets in the US and internationally that accept MasterCard PayPass.
NFC is expected to grow significantly over the next five years, with deputy government CIO Bill McCluggage having recently told Computer Weekly it is a technology that the government intends to incorporate in its digital by default model to "future proof" services.