There are a number of contributing factors which can affect the audio performance of your device for example:
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 for them to resume to normal functionality.
2. If the incoming call has been routed long distance and is being routed through a number of service providers telecoms infrastructure.
3. Technical performance between handset manufacturers, this can be software or hardware related.
4. The environment the handset is used in, especially where there is background noise, typically traffic in a busy city environment or large shopping malls and airports.
5. When speaking into the phone normally (not in hands-free mode), be sure to hold the top of the phone to the ear and bottom near your mouth. Letting the bottom of the phone move away from your mouth can cause muffled audio to heard on by the person on the other end.
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