I think he's saying that he's tried the headset on both phones FIRST and they were fine. Then he took the headset off and found that the N1 quality was good without it. Correct? If that's the case, are you using bluetooth headset? Or wired? If it's wired, see if it's not something to do with the jack. If it's bluetooth, you may have a bad antennae. It's not unusual to have some production defects.
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