There's update I would like to let you know...
I've found one more variable to bluetooth quality. It's called 'Bluetooth Profile'.
To make it easier to understand, think of version. The phone I use is O2 Stealth which has Bluetooth profile version 1.2. It's kinda old...
Then I switch to use another phone, Nokia 3110C which has Bluetooth profile version 2.0 + EDR. I can feel the call quality is better. And no, the high frequency noise cancellation problem doesn't go away. It still existed.
So, in conclusion, a phone with bluetooth profile version 2.0 + EDR will help improve quality of your bluetooth headset.
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