Motorola's flagship phone for 2015, this major update to last year's Moto X steps up to a better 21-megapixel camera, 5.7-inch quad-HD screen, front camera with flash, and a memory card slot.

Over a long weekend of hands-on time with the new $200 Moto G, the latest addition to Motorola's affordable phone lineup drove me totally nuts. The phone frequently crashed when running apps, paused ...