The repair is included in the latest version of Apple's iOS 12 system, which became available to install Thursday.
The bug allowed some people to turn an iPhone into a live microphone while using Group FaceTime. Apple turned off the group chat feature last week, several days after a 14-year-old boy in Tucson, Arizona, discovered the flaw. He and his mom tried to contact Apple for several days before the company responded.
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The delay in responding to the flaw raised questions about Apple's handling of it.
Apple credited the Tucson teenager, Grant Thompson, for discovering the FaceTime bug.
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