While the Galaxy Note 3 is getting mostly positive reviews, some Sprint customers are giving it a million thumbs down for its usefulness as an actual phone. The Sprint forums (among other places) have been overflowing with complaints of poor audio quality on calls. Now Sprint has at least acknowledged there is something to investigate.
The affected users say the audio issue is with calls, not the earpiece. Connections over VoIP services sound fine, but calls on Sprint's network are crackly and distorted.