no buy headphones build in mic
No.
no
You shouldn't use an iPod Touch case designed for the second and third generations on a fourth generation iPod Touch. The fourth generation iPod Touch has a camera and microphone, so the third generation case would cover both of those up, and would not fit it anyway.
The second generation iPod Touch does not have a built-in microphone, but you can connect the new iPod earphones with the controls, which does have a microphone and will work with the second generation iPod Touch.
No, they are not the same. The 3rd generation 8 gigabyte iPod Touch should have a built-in microphone. The 2nd generation does not have a built-in microphone.
Yes, the iPod touch 4th generation (the one with the cameras) has a built in microphone that you can call people with using third party software like Skype.
The difference is that a 3rd generation iPod touch has voice control if you purchase the "Apple Earphones with Remote and Microphone". The 3rd generation is also faster and has a better processing system.
For the 3rd generation, there is one already built-in. For the 1st and 2nd, you can buy an external microphone.
No, but you can buy headphones with built in microphones for starting at about $15
There is none. iPod Touch 3G IS third generation.
Apple has headphones that have built in volume control and a microphone. I have them. You can probably get them at Best Buy for forty dollars