Samsung Galaxy Tab S6 Lite - Calls are not connected; Others cannot hear you speaking on a call; A cellular network or the Internet is often disconnected or audio quality is poor

Appendix
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Calls are not connected
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Ensure that you have accessed the right cellular network.
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Ensure that you have not set call barring for the phone number you are dialing.
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Ensure that you have not set call barring for the incoming phone number.
Others cannot hear you speaking on a call
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Ensure that you are not covering the built-in microphone.
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Ensure that the microphone is close to your mouth.
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If using an earphone, ensure that it is properly connected.
Sound echoes during a call
Adjust the volume by pressing the Volume key or move to another area.
A cellular network or the Internet is often disconnected or audio
quality is poor
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Ensure that you are not blocking the device’s internal antenna.
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When you are in areas with weak signals or poor reception, you may lose reception. You
may have connectivity problems due to issues with the service provider’s base station.
Move to another area and try again.
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When using the device while moving, wireless network services may be disabled due to
issues with the service provider’s network.