BUG: Call Volume - Z2 & S90

Question

Lenov Z2 (not Pro) and Lenovo S90 are suffering from a Call Volume bug of the receiver. Several users have reported here (but also people I know personally) that the Call Volume for these units is too low compared to other phones, in particular for the Lenovo Z2 phones.  
It is barely manageable to hear the other side in a quiet environment like in your home, but while outside of your home (e.g. street or a shop), you can not hear the caller properly. If they speak quietly, you can't even hear them properly at home. This problem seems more pronounced for the Lenovo Z2 than Lenovo S90.
I had this issue on two phones already (Lenovo Z2 and Lenovo S90) and other users reported this problem also for Lenovo Z2, here is a screen shot from this post:
Strangely, the Call Volume of the receiver on Skype is of sufficient quality for me. So that is quite strange that the call volume for the calls is too low. Thus, I hope this is only a software issue and you can set the volume higher for calls?
Finally, let me also restate that this issue  was posted to this forum a few times, so I hope that someone from Lenovo could finally address it. I list a few posts that describe this problem:
Post 1: link
Post 2: link
Post 3: link
In my view a quarter of extra volume would be good. Most of the volume settings are at 50% (e.g. ring tone) but call volume always needs to be at 100% and even that is sometimes not enough. Could you add it up in an update? Or put an option to boost call volume by e.g. 25% in accessibly settings?
P.S. Also one thing that I noticed is that Security App is doing something during the calls that I don't know what that is and how to stop it, it is called Anti-tapping and I am not sure if that can interfere with the call quality or not. I would be quite interested to know what the Anti-tapping does?

Answer 1

Thanks, wangwei. Here is a new idea that could lead to a new cheap feature. Depending on your tests, you could either adjust the call volume as it is. Or you could put a new feature in settings to increase (adjust) the call volume. I.e. by clicking a new toggle switch the user could increase his call volume if he desires to or leave it as it is.
This could be a nice feature that several users could welcome - for example those who are using the phone in loud environments (e.g. factory managers, people working in a bar, commuters) or those who have who have a preference for louder call volume in general (which seems to be my case and a few others who wrote on this forum).
As of yet ,no other mainstream phone seems to have a feature to max call volume for users who want to max it, or leave it on stadarnd level for those who want it as it is. This new feature could go for example in "Audito Profiles", or in "Settings > Features" or in "Dialer > Options > More features and settings"
Finally, strangely, your new Lenovo P70-A has amazing call quality and different call-volume software than S90 and Z2. Thus you could also test S90-A & Z2 versus your own Lenovo P70-A, which I found to have excellent call quality overall comparable to Meizu MX4 in sound and clarity. Not sure why it has a different firmware for call volume.
P.S. Lenovo P70 is currently the best selling phone in Slovakia, selling better than Iphone or any other phone on the market during this month.  Congratulations to your teams who created this phone. The only downside of P70-A seems to be the  weak performance of the selfie camera despite the 5MP (can PM my selfie test results if interested).