What is that hole for on top.

[nitramus]

There is a hole on top and I am just wondering what it is for. It is the same as the one on the side where we can put the sim removal tool. I think it might be a hard reset of some sort like a reboot if the phone completely freezes (since the battery is non removable) or a factory reset or both......
I don't want to try it and regret it

 

[desktop]

Is it near the headphone jack? I think it's a second microphone for noise cancellation.

 

[Lettuce]

I believe it is as desktop said a microphone for picking up external and background noise to cancel out before sending to the network (on a call).

Don't shove the SIM card tool into it!

Lettuce

 

[nitramus]

Thanks. That makes sense.