March's poll was the first conducted by J.D. Power since Apple launched the iPhone 4, but the survey was completed before the Cupertino, Calif. company started selling a model that works on Verizon's network.
Other smartphone manufacturers that made the J.D. Power list were Samsung and Nokia, both with 734 points out of a possible 1,000; and the BlackBerry, with 732.
While satisfaction scores don't necessarily translate into sales -- Nielsen, for example, recently noted that Android-powered phones were used by 29% of U.S. smartphone owners, compared to Apple's 27% share -- Parsons argued that they're critical to keep customers coming back.
"There is a correlation between satisfaction and repeat sales," said Parsons. "That's where the rubber meets the road."
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