Not by default, but you can download a skype app.
Download it from the android market.
skype samsung gt-s5233w
Yes. You can download the app thru Google Play or at the Amazon Appstore.
No, you cannot download Skype on the DSi.
You can download Skype from Skype's Website!
you can download it directly from the skype website skype.com
To download Skype for the Mac you need to visit the Skype website and click on the Download Now button. (See links below)
Yes it does.
Yes. You can call from your contact list, or use Skype/Google Hangouts etc.
you have 2 download skype first
Yes you can, just search "Skype" in Google Play to download it.