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StephenG1CMZ · (This post was last modified: 10-04-2019 09:05 PM by StephenG1CMZ.)

I'd appreciate any tips on how to discover what's wrong with my mobile and/or any tips on how to report the bug, which prevents calls (possibly including 911 calls TBC)..

I am using the mobile as my principal device for voice calls, Internet access and HP Prime emulation, so a factory reset would be disappointing, and rooting the device/sending it for repair/using a paid-for developers SDK impractical.

Background: I rarely do this, so I am not sure if this is a longstanding issue, or an update causing a fault today.

What happened today:
I tried to call 2345 to check my mobile balance (using normal touch dial) . The call seemed to hang up immediately (within a second or 2) and then started playing music. I also saw that Google Assistant was triggering on the screen.
Investigation revealed that:.
Dialled and Contact calls fail.
As I don't want to risk a 911 hangup, I cannot confirm 911 calls are affected but cannot trust the device (actually, its 999 or 112 here).
Incoming calls fail.
The culprit music app is Huawei Music Player (force stopping ceases playback).
The culprit music app is a system app and cannot be uninstalled.
And on demonstrating the fault to someone:
Unplugging the headphone allows calls to be made!!!
It works with a different headphone (I haven't yet retested the original headphone).
I'd be interested in any hints from the helpful folks here on the following points:
Technical:
How can I discover what is triggering the fault? I know its the headphone socket/headphone, but what is activating the Google Assistant and Huawei Music Player? Actually, it looks like it is a specific headphone (or the fault has been fixed remotely) - but why would one headphone trigger Hangup/Play Music, and another headphone not?
How can I test 911 calls without risking a hangup?
Is there a similar test number with the same phone behaviour but without the potential annoyance?
When I used to test BT landlines I was isolated, so I could test 911/credit card interaction without worrying about the dispatcher.
Bug reporting:
Where should the fault be reported ?
Huawei? (the phone manufacturer and supplier of the culprit music app)
Google Assistant?
Ofcom/FCC?