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Apple today released the fourth beta of iOS 7.1 to registered developers for testing purposes



From MacRumors:
The last version of iOS 7 available to the public, iOS 7.0.4, was released back in November. There are still several known issues for Apple's engineers to address, so iOS 7.1 will likely not be released to the public without at least one more round of beta testing.
  Apple Releases iOS 7.1 Beta 4 to Developers