Both iPod and iPhone had a great impact to IxD. For example, I really obsessed with iPod classic dial. It created a new way for people to use mp3. When you spin the dial, you can select a song or switch to cover flow to enjoy the album. It feels amazing and smooth. Everyone can know how to use it without reading the instruction manual. Apple also provided a special feeback while you spinning the dial. It feels very high-end and has a premium feel.
The iPhone 4’s unlocking interface was groundbreaking at the time. Users simply swiped a slider at the bottom of the screen to unlock the phone, accompanied by a crisp sound effect. The entire operation was very consistent and comfortable to use.