Apple unveils iPhone 4

Apple Inc unveiled a new iPhone on Monday that goes on sale in scores of countries this year, preparing its fastest-ever global roll-out to try and stay a step ahead of rivals like Google Inc in a red-hot smartphone market.

CEO Steve Jobs showed off a redesigned $199 "iPhone 4" that is a quarter slimmer than the current handset. The device boasts a higher quality screen and better battery life, video chat via Wi-Fi, and a gyroscope sensor for improved gaming.

Despite the iPad's success in its first two months on the market -- more than 2 million sold in 60 days -- the iPhone remains Apple's main growth line, and the international market is key. Some analysts estimate more than two-thirds of iPhone sales are now coming from overseas.

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