Apple just released a press release announcing that there was over 600,000 iPhone pre-orders and Apple said that it was "far higher" than they expected and that was the reason for the frustration and difficulties when pre-ordering which Apple apologized for.

Earlier today, the carrier partners announced that the iPhone 4 pre-order traffic was 10x the amount of the iPhone 3GS. AT&T also said today that it had received 10x of pre-order sales on the first day compared to the 3GS.

You can read the Press release here.

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Source BGR