Samsung's next big thing just keeps getting bigger. The 6.3-inch Galaxy Mega pushes smartphone dimensions into nearly ridiculous proportions. Marketed as a midtier device, the $149 phablet for AT&T delivers solid performance, minus some of the high-end amenities of the Galaxy S4. But AT&T and Samsung are willing to bet that consumers will overlook what's missing in exchange for the Mega's massive display. Is this phone too big, or just right?