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See if I was not on the phone with Comcast I would have gotten you instead of talking to them about a new modem i want to change my old Motorola Surfboard with...laughing.Do you have the mute switch on? Have you increased the volume using the volume buttons? The icon you referenced is the screen lock. When enabled, your device will NOT switch to landscape mode. To disable it, just swipe up from the bottom of the screen (if you have iOS 7) and then tap on the last icon at the top. If you have iOS 6, just swipe to the right.