My mom recently got the Samsung Galaxy S III because she wanted a bigger screen, but she also promptly signed up for a class at Verizon because she found the device too complicated to use. While Samsung helps by including lots of pop-up tips, I suspect many people just dismiss them after a while. Thinking about switching from a Motorola Android phone to an HTC device or from an LG to a Pantech? You'll find plenty of interface tweaks that really add up to a different user experience. iOS 6 has a lot of new features, too, but the underlying interface remains as simple (albeit plain) as ever.