[arrrghhh]

If you can run skype, you should be able to use it.

You don't need any extra apps... If you turn on & use wifi, it's using wifi. If you turn off wifi and can still get online, then it's using cell radio to get a data cxn - which I think if you don't pay for it doesn't the cxn fail? I'm not too sure how this works, I've always had data plans.