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my phone one speaker is not working
Hi @ANSHH, sorry to hear about your phone and I apologize for the late reply.
Which speaker is it that isn't working in your phone?
I would recommend that you start with testing both speakers in the inbuilt test in the phone which you can find in Settings > About phone > Diagnostics > Test > Ear speaker/speaker. If one of them isn't working in here, try rebooting your phone in safe mode and run the test again when third party applications aren't loaded so we can see if one of them is the cause of this.
Let me know how it went!
Hello, I have a big problem and I would love to be able to help. I would not be walking the microphone when I put the loudspeaker in calls and video calls. The other person does not hear me when I put the speaker on the phone. Why could it be? And how can I solve it?
Hi @Miilu-, sorry to hear about this. 
Do I understand you correctly that when you enable speaker phone during a call the counterpart can no longer hear your voice, is that correct?
If that is the case, could you try recording a video with your phone and speak during the video and see if you are able to hear your voice when watching the video when you are done with recording it?
You can also try and reboot your phone in safe mode and make a call when third party applications aren't loaded so we can make sure that they aren't the cause of this!
Let me know how it went!