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Helpful answers
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Mar 31, 2016 1:32 AM in response to Daosroby D.Cohen,Take a look at this:
If you can‘t hear a person on a call or voicemail or if the sound isn‘t clear on your iPhone
Try to reset your device. This won't delete your data stored on this device.
- Press and hold the Sleep/Wake button
- Press and hold on the Home button
- Keep holding both buttons until the display turns off and back on with Apple logo on it.
Alternatively, you may go to Settings - General - Reset - Reset All Settings
Also, call your carrier and ask about the signal quality in your area.