No, you can't trade for a 4G. If you want to buy a 4G, it costs $149.99 plus tax.
no
no
iPod Classic, iPod Nano 1st Generation, iPod Nano 2nd Generation, iPod Shuffle, iPod Nano 3rd Generation, iPod Nano 4th Generation, iPod Touch, iPod Nano 5th Generation.
the new ipod nano is 6th generation
yes
how to unlock a ipod nano 4th generation
It depends on the generation of iPod Nano and the condition it is in. For a 5th generation iPod Nano in an okay condition (scratches and wear somewhat evident), you would probably get around $80 dollars for it.
The iPod nano 2nd Generation is not capable of playing video. The first iPod nano that was video capable was the 3rd Generation iPod nano.
ipod nano 5th generation,
It depends on the condition, color, and generation your selling your iPod Nano in, plus any other content you will choose to leave on the iPod Nano.
There is no 8GB 2nd generation ipod nano it only went to 4GB but 3rd generation had video.
You cannot connect to the internet on a sixth generation iPod Nano. That generation of iPod Nano does not have Wi-Fi capabilities.