Hearing issue
Unable to make calls. Sometimes voice breaks in hearing & many of the time i can’t hear voice of the person called
iPhone 12 Pro, iOS 14
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If you are not able to hear the other person, click this...>If you can't hear a person on a call or voicemail or if the sound isn't ...
If you only hear through speaker phone mode --> If your iPhone is stuck in headphone mode - Apple Support
If the other person is not able to listen to you then please click this--> If the microphones on your iPhone, iPad, and iPod touch aren't ...
If the above options do not mitigate the issues then Contact your carrier and then Contact Apple Support