Lumia 930 back cover vibration during calls

[Naor Eini]

Hi,
Has anyone noticed that the device vibrates on calls? Not like the usual phone vibration, more like every time the other side speeks the entire phone has a strong vibe from the sound of the person's voice.

Other than that, it's a great phone.

 

[Styrmir]

I have notice some vibration.Not sure if it is the speaker or buttons. But it is more apparent when speaking to someone with a higher pitch voice.