Voice Quality: My counterpart thinks I'm in America

Eventually everyone but my callee then said that he hardly understand me ... hear it in itself, as I call from America with einerm 20s phone ... dull, sometimes choppy, simply unclear ....

I of course did not believe and had even heard how someone sounds who calls me from my Y201 Pro (to landline and other smartphones, each with the best reception situation): Ghastly !!! On the microphone hole, incidentally no chewing gum sticks ...

Then I once made a comparison and talked with the following phone / SIM card on my T-Net box (so that I can arbitrarily often all listen) ... all from the same location ... this is the result:

LG P500 / O2: very good
LG P500 / D1: very good
Alcatel 997D / O2: very good
Alcatel 997D / D1: very good
Huawei Y201 Pro / O2: bad
Huawei Y201 Pro / D1: not so bad ... but still bad

There are reviews here that say that the voice quality is very good in both directions, I believed in an individual case and ordered a second Y201 Pro at Amazon with the same result.

Whether Huawei has changed any chip or something in the meantime? No Idea.

As a reasonably intelligible voice quality is the basic requirement of a smartphone, I have not tested the unit ... Even if it could make coffee, so Stern are not more than 1 in it.

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Edit, new knowledge, after I sent both Y201 Pro back:

If a noise filter Problem of Dual Mic (in speakerphone no problems), have googled times in the direction ("2846579 dual mic"). The problem stretches across nearly all smartphones Huawei ... in which one does not, but in some already:

The solution seems to be in fact:

Type this to dialer (without blanks):
* # * # 2846579 # * # *
Then select ProjectMenu / Background setting / Dual Mic Setting (turn off)
Note: This is a Huawei secret code to get into the Test Menu.
This setting is made but when you reboot your back. Supposedly you can make it so permanently (Root required): /system/build.prop ... change or add the Following line:
ro.config.dualmic = false