The iPhone 5 that Apple introduced last week with only incremental changes seemed to signal that the industry has entered an era of technological bunny hops.
Faster chips, bigger screens and speedier wireless Internet connections are among the refinements smartphone users can count on year after year in new models, most of them in familiar rectangular packages. They are improvements, to be sure, but they lack the breathtaking impact the first iPhone had, with its pioneering fusion of software and touch screens.
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