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Apple has disabled a group-chat function in FaceTime after users said a software bug could let callers activate another person's microphone remotely. With the bug, a FaceTime user calling another iPhone, iPad or Mac computer could hear audio even if the receiver did not accept the call. The bug is triggered when callers add themselves to the same call to launch a group chat. There is no longer a danger from this particular bug as Apple disabled group chats, while regular, one-on-one FaceTime remains available. Apple said Tuesday that a fix will come in a software update later this week.