If you pay attention to the mobile device market, it's difficult to ignore the trend that smartphones are growing in size, while tables are shrinking. A common size of smartphone, five inches, is dangerously close to a common size of tablet, seven inches. Now, Samsung is crossing that 2-inch line with the announcement of the Galaxy Mega, a smartphone that comes in the choice of a 5.8-inch model, or a 6.3-inch model.