Have you noticed that your iPhone calls don’t sound as clear as those you make over FaceTime and WhatsApp? There’s a reason for that: Apple uses a feature known as voice isolation to block out the background noise in calls made over the internet.
Surprisingly, the noise-cancelling trick has been missing from regular phone calls. These are the calls you make using your phone’s network, which sees sound travel as analogue signals over cables and other communications infrastructure.
