Samsung's runaway success with the big-screen smartphone even spurred Apple to release a supersized model this year. "The size of the phone really is at the sweet spot," said Drew Bamford, corporate vice president of HTC Creative Labs, which studies how consumers use phones. Hong Yeo, a senior designer at Samsung, said those who really need a larger screen could turn to other models, such as the 5.7-inch Galaxy Note 4. The new Samsung S6 Edge phones also have better screen resolution even as the size remains the same. Consumers do like larger displays as they rely increasingly on mobile devices for entertainment and information. Preferences for larger phones can be seen in the high demand for both the iPhone 6 and 6 Plus, which made Apple the world's top smartphone maker in the final three months of 2014, according to Gartner. Ramchan Woo, a vice president and head of mobile product planning at LG Electronics Inc., said the 6-inch display of the original G Flex was both a chief compliment and a chief complaint. Shoneel Kolhatkar, senior director of U.S.