Why is the quality of the microphon so bad

The sound quality while using the telefon is very bad. When I talk with someone the other person can hardly understand me. When I talk with the freehand function the quality is good. Is it a hardware or a software problem?

Hi H-Kurt,
Thanks for visiting Apple Support Communities.
If you can't be heard clearly during calls on your iPhone, but speakerphone is working normally, start with the tips in this article:
iPhone: Microphone issues
http://support.apple.com/kb/ts5183
Best Regards,
Jeremy

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