Voice calls fading in and out?
I Phone 6s plus 128Gb with IOS9.2.1 (13D15)
When on voice calls, people complain that my voice fades in and out to the extent that they cannot hear me at all.
When I use Bluetooth or a headset this does not happen therefor it is not a network or service provider problem.
It improves slightly when using speakerphone
The microphone works perfect with Voice memo so it is not the microphone malfunctioning.
iPhone 6 Plus, iOS 9.2.1