Listed as having support for AT&T's 3G bands (850MHz/1900MHz/2100MHz), it's very possible that it may arrive later at at the carrier. T-Mobile subscribers can pick up an unlocked Arc as well, though it won't support T-Mobile's 3G network.
Sony Ericsson started off the year with a bang, announcing the Android 2.3-powered Xperia Arc at CES 2011. As one of the first Gingerbread-powered phones after the Nexus S, hopes were high and things looked good. Here was a super thin, gorgeous handset with the latest version of Android.
Hardware was impressive as well, with a 1GHz processor, 4.2-inch display, 1GB internal storage, an 8.1-megapixel camera, GPS, Wi-Fi, and Bluetooth support.