TUAW: “Good news for those wanting to purchase an iPhone 4…in the US anyway. Shipping estimates have improved from three weeks to between five and seven business days, according to Apple’s US online retail store. Improved shipping estimates usually indicate that Apple is catching up with consumer demand.

The iPhone 4 has been in high demand since its release in June, selling well over 1.5 million devices in its first three days of availability. But supply is still short, especially with expansion into the overseas market. According to AppleInsider, mobile carrier China Unicom was only able to meet about half of the pre-orders placed by customers, with the rest having to wait until the end of October for their orders to be fulfilled.”

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