The iPhone 4 won't be available in stores until Thursday, but the reviews are coming in from those who were able to get their hands on them ahead of time. Despite a mostly warm reception, there are already scattered reports of defective screens.

By Wednesday afternoon Gizmodo and MacRumors had reports from 20 people with a brand new iPhone 4 who say there is a yellow discolored area on the screen, or an overall yellow hue to the display even after adjusting the phone's display settings. In most cases, the users say Apple has offered to replace the phone.

The new Retina display is supposed to be one of the biggest improvements to the iPhone.

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