First they made a video testimonial featuring a bunch of excited developers. Last week brought us a promo clip they first played back to journalists who attended presser in May. Then came the first official Google Wallet commercial featuring Seinfeld’s George Constanza and his exploding wallet. Today, the search company has officially rolled out Wallet, a mobile payment service.

As you can see from the clip we embedded above, it features Google engineers highlighting the many benefits of paying simply by tapping your phone to a terminal. One thing immediately captures attention: The “hundreds of thousands” of points of sale which support Google Wallet, all MasterCard PayPass terminals. Google promised at the May unveiling they would support more smartphones with an NFC chip in the future, not ruling out  a next-gen iPhone. Today, the company wrote in a blog post:

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.

If you’re a Sprint customer with a Nexus S 4G device, the Google Wallet app will be delivered as an over the air update. Just tap the Wallet app on your home screen, add your Citi MasterCard credit card or set up a Google Prepaid Card and transfer some funds to it from any of your credit cards and off you go.

Early adopters who set up a Google Prepaid Card before the year’s end also get a $10 free bonus. When you see the Google Wallet logo on a poster, simply scan it with your phone to add the advertised offer or coupon to your Google Wallet account. The below walkthrough by TechCrunch lays out everything you need to know about Google Wallet in Layman’s terms. Good-bye wallet, the phone will take it from here and another from ThisIsMyNextexpand full story