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SEATTLE (AP) — Consumer Reports says the iPhone 4 has reception problems caused by its antenna design.

After the iPhone 4 went on sale in June, buyers started complaining that holding the gadget a certain way could cause calls to drop.

Apple has said that any phone will lose signal strength when gripped in certain ways. It said the iPhone 4 seems to show a larger drop because it has been using a faulty formula to decide how many signal bars to show.

But Consumer Reports says it tested several phones that use AT&T Inc.'s network, and only the iPhone 4 seemed to have the reception issue.

Consumer Reports says the iPhone 4 will not be marked "recommended" on its updated smart phone ratings list because of this problem.

Copyright 2010 The Associated Press.

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