Google Inc. plans to unveil a mobile- payment service May 26 that will be available on phones from Sprint Nextel Corp. (S), three people familiar with the matter said. The service will let consumers with specially equipped phones that run on Google’s Android operating system pay for goods and redeem coupons with their handsets, said the people, who wouldn’t be identified because the plan isn’t public. The technology is available on the Android-powered Nexus S from Sprint, the third-largest U.S. wireless operator. Google is rolling out so-called near-field-communication technology, which lets people pay at NFC-equipped cash registers with a flick of their phone, to boost revenue from mobile advertising and discounts. U.S. spending on mobile coupons may rise to $6.53 billion in 2014, up from $370 million last year, according to Borrell Associates Inc. Get the full story at Bloomberg