Apple enthusiasts who got their hands on the latest iPhone model have reported hearing worrying hissing and buzzing sounds coming from their brand new devices.

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Jefferson Graham goes hands on with the new iPhone 7, showing off new features at an Apple event in San Francisco. Produced by Theresa Chong. Video by Theresa Chong

APPLE chief executive Tim Cook has taken to the stage at the Bill Graham Civic Centre in San Francisco to reveal the iPhone 7 and the iPhone 7 Plus.