Apple iPhone users are being warned of a bug that allows eavesdropping on their devices through the FaceTime app. The software glitch reportedly allows a caller to hear audio from a target device before they either pick up or reject the call. The bug is said to affect devices using versions of iOS 12.1 or later. The website said that calls have to made in a particular way in order to exploit the glitch. Some tech experts suggested iPhone and iPad users disable FaceTime until a fix is rolled out later this week.