Earlier, we reported that a number of customers have reported an odd yellow-ish discoloration on the screen of their new iPhones. This is a disturbing issue for anyone considering an iPhone 4 purchase. While Apple hasn't made an official statement yet, several of their support technicians have claimed that the issue is due to the manufacturing process.
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The yellow spots are apparently residual glue from the screen. Technicians have advised customers to ask for replacement iPhones, rather than waiting for the spots to go away. If you are one of the customers affected by this issue, I'd recommend calling Apple for a replacement now before the iPhone 4 sells out everywhere.