The record load of 600,000 iPhone 4 pre-orders not only dented Apple's and AT&T's websites, but it has also forced Apple to push back by 12 days -- to July 14 -- the date for delivering pre-ordered handsets. Despite the hiccup, Apple's shares surged to record highs Thursday, with one analyst predicting the iPhone's customer base could increase to 100 million by the end of next year. Reports emerged Thursday that the handset will carry double the RAM of earlier iPhones and that analysts say they believe improved performance and a sleeker design are behind the sales frenzy.

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