It makes sense. Your brain uses all kinds of cues even if you don’t realize it. That includes things like smiles and even some degree of “lip reading”. If you can’t see someone’s mouth moving, you lose some cues and your brain has fewer signals to rely on when interpreting speech.

That said, if you can take a phone call, you can understand someone through a mask. It’s not an impenetrable barrier for communication.

It does not require an iPhone.

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