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This has no problem to do with the phone as far as i know.
It occurs normally when you are talking to someone who happens to be in a very quite and large room without that it empty. this is due to the empty vaccumm that causes the sound that is produced to be reflected back into themic of the phone and as a result causes you to hear your voice.
Also, another thing that causes it is when you talk to someone who puts the call on loudspeaker and there are multiple surfaces causing the reflection of the sounds you make.
In summary, there is nothing wrong with your phone and you just need to tell whoever you are talking to to try and move to an area that is a bit occupied so as to prevent echoes.
The faulty might comes from your earpiece(small speaker) or from its track or missing track.But first check if your phone shown some symbol.If symbol like headset without connecting handsfree the problem comes from charging connector.First You have to do is just clean the pcb.the tips of earpiece.
I have just bought a K850i. One time I calling somebody but I could not hear any sound from the phone.I could not hear its ringing when i make calls and cannot hear the voice of the person I am calling.I used the loudspeaker its work properly the voice quality is good. Please help me solve this problem.Thank you.