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May 25, 2015 12:33 PM in response to Asker daffyby ChrisJ4203,Try looking at the hints in this support document. If you can't hear a person on a call or voicemail or if the sound quality is poor on iPhone - Apple Support
Sorry, just realized you said they can't hear you. If your voice is too faint or sounds unclear using iPhone, or iPod touch - Apple Support