Google Wallet--an app that makes your phone your wallet--with Citi, MasterCard, Sprint and First Data is now available to all Sprint Nexus S 4G phones through an over-the-air update--just look for the "Wallet" app.
With Google Wallet, you can tap, pay and save using your phone and near field communication (NFC).
Google Wallet enables you to pay with your Citi MasterCard credit card and the Google Prepaid Card, which can be funded with any of your existing plastic credit cards. As a thanks to early adopters, we're adding a $10 free bonus to the Google Prepaid Card if you set it up in Google Wallet before the end of the year.
Also, today, "Visa, Discover and American Express have made available their NFC specifications that could enable their cards to be added to future versions of Google Wallet," stated Google.
Here's a demo of Google Wallet in action: