Apple shipped 20.3 million iPhones globally in the second quarter, the first time it has led the pack as Samsung Electronics, Nokia, Research in Motion and HTC followed, research firm IDC said. "Demand has been so strong that even [iPhone] models that have been out for one or two years are still being sought out. With an expected refresh later this year, volumes are set to reach higher levels," said IDC analyst Ramon Llamas. IDC also predicted that smartphone shipments will grow by 55% this year, while Gartner said mobile data revenues should climb by 23% in 2011.

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