Nokia Lumia 820 microphone question

[abc458926]

Please look at the location of the microphone (bottom left). Do you think he is not clogged with dirt and grease, when you wipe the screen? Of course, there's still a hole of the speaker, but it is much more. Any ideas?

 

[unboxfetish]

Where is the mic? All I see is a little divot in the bottom left edge of the glass, but it doesnt look clogged. Also arent there 3 mics?

 

[abc458926]

Where is the mic? All I see is a little divot in the bottom left edge of the glass, but it doesnt look clogged. Also arent there 3 mics?

contamination during use. I mean after a while

 

[Muessig]

The 820 is listed on Nokia's site as only having 1 mic, compared to the 3 special ones (can't remember the name) in the 920.