Unlocked Sony Xperia Z1 Compact with 20.1-megapixel camera and 4.3-inch 720p display available in the U.S. Sony has added a new unlocked Xperia smartphone to its U.S. online store. The unlocked Xperia Z1 Compact brings high-end specs to a mini smartphone and is capable of running on AT&T or T-Mobile's 4G LTE network. by James Geddes