In fact, there is a good chance your phone does this when it is in speakerphone: https://developer.apple.com/library/ios/qa/qa1799/_index.html https://developer

In fact, there is a good chance your phone does this when it is in speakerphone: https://developer.apple.com/library/ios/qa/qa1799/_index.html https://developer.apple.com/library/ios/qa/qa1799/_index.htm....