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I have notices that sound only comes out of one speaker on the bottom of my phone. Is it playing in mono or is the other "speaker" actually a microphone?

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up vote 13 down vote accepted

The iPhone 4 only has one speaker. The matching screen on the other side of the phone is for the microphone.

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This is also the case for the iPhone 2G, 3G and 3Gs. – drfrogsplat Nov 12 '10 at 4:11
We learn something new every day. Thank you :) – Nippysaurus Nov 12 '10 at 5:07
iPhone 2G, 3G, 3GS are almost the same: on those, the speaker is left and the mic is right. – Torben Gundtofte-Bruun Nov 12 '10 at 7:44
I've had an iPhone 4 for over three years and somehow never noticed this until just a few days ago. I thought I had damaged it somehow – that's a relief! – daGUY Feb 18 '14 at 19:47

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