Guys, the 3rd hole near the right side of the speaker is not a microphone. Its the hole for a sensor such as humidity. I tried blowing into it with a humidity app and it spikes up and down depending if I blow in or suck out.

Ps: this maybe old info but just to let people who don't know.

Therefore you can actually afford to cover the hole with a case but make sure its not a 100% seal off.

Wanam bug.. when you use the power manager setting to go into download, the phone will enter a download loop.

Fix: Press - power, vol down key and home like then entering download mode, then volume down to restart.

Will save you from removing the batter to reboot normally.