The Wall Street Journal reports that Apple's engineers are working on a software upgrade to fix problems with the iPhone 3G's "immature chipset and radio protocol stack," the most likely cause for complaints that the new models drop calls a lot when in 3G mode. Apple uses a custom chip made by Infineon, a German supplier. Officially, no one is saying anything. In reality, "people familiar with the matter" are getting out the word for the companies involved. (Photo by AP/Paul Sakuma)

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