iOS 6 makes it easier to respond to incoming calls--or ignore them. A button on the right side of the screen lets you reply with a message (it can be canned or custom) or have your phone remind you later. The reminder can be based on time or location, such as when you get to work. A new Do Not Disturb feature lets you decide which calls get through, whether it's individuals or groups you create. If someone calls multiple times within a few minutes, you can let that call through.