Hey @aqm_android,
Really sorry to learn that you're currently experiencing this with your phone 
Can you let me know if this happens on every call that you place or receive? Also, how many signal bars does your phone usually connect to?
Have you tried restoring the phone to see if that helps?
Keep me posted.
Hello Aqm_android,
It appears that call quality is a common issue with LG phones. In some cases, others have also noted that call quality was worse in the G6 than in the G3. One thing you might consider trying is to change the Noise Suppression and Call Clarity settings. You should be able to find those settings under: Call settings --> Advanced --> More.
There are conflicting reports as to which position (enabled or disabled) works best. Some people have claimed that enabling the settings solved their issues while others had to disable the settings. You'll just have to test it out for yourself.
@@aqm_android wrote:...Right now, I am standing beside a window on the 3rd floor that overlooks a field, that is, in an open area, and I can see only 2 or 2.5 signal bars..
Do you see those signal levels when you are on a call or when the phone is in standby? Are you trying to make those calls with voice-over-LTE (voLTE) or the traditional '3G' or 2G networks? If you're not using voLTE, the calls can only be transmitted via the UMTS ('3G') or GSM (2G) networks. Phones will likely connect to LTE while in standby, but then have to switch networks when making or receiving calls. You might notice a different in signal strength during calls. Depending on your location relative to the cellular towers, it can be normal for the LTE signal to be lower. It has to do with the differing characteristices of the various frequencies used. I have previously discussed the phenomenon in some earlier posts.
Do you know where the cellular towers are located near location? You can get an idea of your surrounding towers here. If the closest cellular tower is behind your building (ie opposite to the field you're overlooking), standing beside the window will not likely improve signal because the signals have to go through the building to get to your phone. Do you get the same issue outdoors? How about at different locations?
Hope this helps 
Cheers
@aqm_android wrote:...I will test it with some calls soon and let you know.
Hello again,
VoLTE should be automatic. You might also consider testing with voLTE disabled as well as disabling LTE altogether. You can disable LTE by selecting GMS/UMTS in your network mode.
Hope this helps
Cheers
Hello again,
Yes, if you disable LTE, your phone will only be able to access the GSM (2G) and UMTS or WCDMA ('3G') networks. However, in theory, connecting to the UMTS network with HSPA+ (H+ or 4G) allows speeds similar to that of LTE. That's why it's technically considered 4G by the International Telecommunications Union (see here).
That said, I only suggested you disable LTE to determine whether your issue related to your phone connecting to the LTE network. I didn't mean for you to disable it indefinitely. I apologise for the confusion.
I'm glad that your calls have improved with the changed settings!
Hope it continues to work for you
Cheers
That's awesome! Thanks so much for keeping us updated. Don't hesitate to reach out to the community again if you have any other questions. Also, feel free to accept Cawtau's post about noise suppression as a solution to help others who might have the same situation.
Hey aqm_android!
If you disable LTE, you'll only get 3G speeds when using your data.
And, thanks for the update about the Noise Suppression setting! Don't forget to keep us up to date about how things go with your continued testing.
Thanks for confirming @aqm_android!
Can you try the factory reset? If the issue is caused by a glitch with the software, this should do the trick.
Let us know how that goes!
