When Apple released the first iPhone, its 3.5-inch touchscreen seemed huge compared to the displays of other phones. Nonetheless, competitors responded with even larger screens, trying to find areas where they could provide clear alternatives to Apple hardware. Consumers responded positively, so the competition started making even bigger phones.
iPhone 5C - News, Features, and Slideshows
Each time Apple introduces a new iPhone model, we get many questions about compatiblity: Will the accessories you already own--cases, speakers, chargers, and the like--work with the new model? In some years, such as when Apple replaced the iPhone 4 with the iPhone 4S, there are few physical and electrical differences, so almost everything works. Other times, Apple changes both the size and the electronics of the phone: The iPhone 5, for example, had both a different shape and a completely different charge/sync connector.