Why did my internal microphone quit working?

If your iPod 3G was swapped presumably you got another 3G. The 3G does not have an integrated microphone. The microphone is in the earphones that came with the 3G. Attach them and you should be OK.

When did you purchase your original iPod Touch? The iPod Touch 4g was introduced in September, 2010.

Only the iPod Touch 4G has a built-in microphone. If you really did have a iPod Touch 3G as you stated in your first post then it would not have had a built-in microphone.

If you have a 4G now then it will have also had a camera as well as a built-in microphone. Does what you have now have a camera? If so, it's a 4G otherwise it's a 3G or earlier model.

I don't think that Apple would have intentionally switched a 3G model for a 4G but if that happened go back and complain.

Go here to see the features of the various iPod Touch models: http://en.wikipedia.org/wiki/IPod_Touch

Apple has information on determining iPod models here: http://support.apple.com/kb/ht1353

If you have the iPod Touch 3G then *the microphone is a part of the earphones that came with it*. Trust me, I have an Pod Touch 3G and I know what I'm talking about.

If you lost the earphones you can buy another set from Apple: http://www.apple.com/ipod/in-ear-headphones/

That's the fact, Jack!

No built-in internal Mic on the 3rd generation iPod Touch models.

See the Specs here:
http://support.apple.com/kb/SP570

The best way I found to identify what generation of iPod Touch a person has is to have them look on the back of the iPod Touch for the model/part number...
Here are the numbers for the 2nd and 3rd generation iPod Touch models that do not have a built-in internal Mic.

iPod Touch 2nd generation - A1288

iPod Touch 3rd generation - A1318

Only the 4th generation iPod Touch has a built-in internal Mic...

Joseph Kriz wrote:
No built-in internal Mic on the 3rd generation iPod Touch models.

I think that point was made in my first reply but not much progress has been made since then. 😉

Next advisor please step up.

Yes it was but he wanted someone else to verify your accurate response.

I think we all have seen many things here.
Last week I saw someone state they had a 2nd generation iPod Touch with multitasking.
And now one that claims they had a built-in Mic on a 3rd generation.

Not sure how or why these show up but apparently these people honestly state they had those functions.
I assume these could have been prototypes and these people actually had those functions that aren't, or weren't, included on the retail models.
That would be the only explanation I can guess at.

In this case, his Mic didn't stop working that the title states.
His iPod Touch was exchanged for a different 3rd generation unit.
Now this replacement does not have a Mic which is correct. It should not have a built-in Mic...