The phone is 8.99 millimeters (0.35 inches) thick -- a fraction thinner than Apple's iPhone 4 -- and has a 4.5-inch Super AMOLED display, one of Samsung's most advanced, said Jeff Bradley, senior vice president for devices at AT&T Wireless.

The device weighs 133 grams (4.7 ounces) and is powered by a single-core ARM processor running at 1.2GHz. It runs Google's Android 2.2 OS and will go on sale in the U.S. on May 15, priced at US$199 with a two-year wireless contract. It runs on AT&T's HSPA+ (Evolved High-Speed Packet Access) network, which AT&T considers a 4G service.

The display shows more pixels than Samsung's previous AMOLED smartphone screens offered on the AT&T network, Bradley said. Infuse also has an 8-megapixel camera with auto-focus and flash.

It's the latest addition to Samsung's portfolio, which also includes the Galaxy line of smartphones and tablets. The new phone was previewed in January at the Consumer Electronics Show, where AT&T said it would introduce multiple 4G and Android devices this year.

Samsung and AT&T have partnered with mobile gaming company Rovio to include a special Angry Birds edition for the smartphone. There were no details about whether it will be sold overseas.