Samsung seems to be trying extra hard to be the iPhone replacement for AT&T ( T). By appearances, the Samsung Infuse looks very much like a large version of the iPhone 4, at least from the front. Samsung had reasonable success with Android phones in its Galaxy series; with the Infuse, it hopes to take that one more step higher. The phone has a massive 4.5-inch super-AMOLED-plus screen that is designed to provide better resolution and easier daylight viewing. The Infuse runs on a speedy 1.2-gigahertz Hummingbird single-core processor. Its front-facing camera is a wimpy 1.3-megapixels, but the rear camera captures 8-megapixels. The Infuse runs on the HSDPA-Plus wireless technology, which AT&T started calling 4G. The Infuse, sort of like the 5-inch Dell ( DELL) Streak, attempts to push the limits of super-phone sizes in an effort to skirt the fringes of the larger tablet market. AT&T starts selling the Infuse this spring.