The ranks of unhappy iPhone users continues to swell as Apple customers have complained about problems maintaining a signal on the company’s new 3G handset, reports the San Francisco Chronicle. Over the past few weeks, customers have flocked to Apple’s online support forums to complain about weak or fluctuating signals leading to dropped calls and long download times. "I have had my iPhone since this past Sunday," wrote one iPhone customer on an Apple support forum last week. "The reception issues began immediately with 3G flip-flopping between ‘no signal’ and up to four bars–but usually hovering between none and two." Not all iPhone users are reporting problems, but a growing number of anecdotal reports from around the world indicates that the phenomenon might be widespread. Apple has yet to publicly acknowledge the problem, compounding the frustration for some users…

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