Huawei GAR-UL00, Faq

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Second, the national OMTP standard, which uses a 3.5 mm headset jack with a pinout of Left
Audio, Right Audio, Microphone, Ground. If a CTIA standard headset is connected to a
non-CTIA headset jack, the user will hear static through the earphones and will only be able
to hear the caller when they press the microphone button.
All Huawei phones use CTIA headset jacks. If you try to use OMTP headsets with your phone,
you may experience the above issue. CTIA headsets are identifiable by their white insulating
ring.
4.190 When using the built-in video player to play MKV
videos that use the AC3 audio codec, why is there no
sound?
AC3 is an audio codec owned by Dolby which must be purchased by manufacturers to offer
playback support. In the past, Huawei phones used Dolby codecs, but we have now switched
to DTS.
4.191 Can I use the active noise reduction headset for my
phone?
Yes.
4.192 Can I download the application of Director Mode
from Huawei App Center? Is Director Mode only
pre-installed on the P8?
Yes, you can download it from Huawei App Center.
Yes, it is only pre-installed on the P8.
4.193 Where is the main microphone? Is the noise
reduction microphone near the headset jack on the top of
my phone?
Your phone provides two microphones: The main microphone is on the right side at the
bottom of your phone and the noise reduction microphone is near the headset jack on the top
of your phone.