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Digital financial transaction services, Google Wallet, finally released officially. Nexus S 4G Google users in the United States that runs on the Sprint network, be the first time who will enjoy this service.

Google Wallet technology using Near Field Communication (NFC) is embedded in mobile phones. Previously, Google Wallet service has been tested extensively before launched to the public.

Google Wallet application is available for your Citi MasterCard credit card holders. Then next to Visa,Dicover and American Express.

It's simply enough to use, just find Wallet application, then download it. As a payment system, users simply put the handset on the existing payment terminals in various locations of transactions, such as stores or supermarkets.

MasterCard itself has about 144 thousand terminals across the U.S. that allow transactions via Google Wallet. When using it, the payment will automatically be charged to your credit card.

Still no further information when the Google Wallet will be available in other country. In the UK, Google Wallet reportedly will be released in the near future anyway.

Amazon AppStore was released in March 2011 and now become a retailer of Android applications beside the Android Market.

AppStore offers hundreds of Android applications with a better arrangement than the Android Market. It also have a program called 'Free App a Day' which allows users to get premium applications for free every day.

Here the list of Most Download and Best Seller Android application in Appstore: