There are a number of contributing factors which can affect the audio performance of your device:
1. The most common cause of poor sound quality is water in the microphone or speaker. If the handset has been subject to immersion in water then the microphone and speaker may need to dry out to resume normal functionality.
2. You, or the other person you are speaking with, may be in an area of poor signal. Try moving to a different area.
3. You may have dirt / debris covering the microphone or speaker. If so, clean your device.
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