Yes, there is an option for a limited or unlimited data plan. Currently you can either get a plan with AT&T or Verizon.
3G is basically the internet wherever you go. However you will need to pay for 3G technology.
You only have to pay if you buy it with 3G capability
somewhere
If you want a 3G SIM card to work, you will have to get a contract with some mobile provider. You can choose from many different providers, but you will have to pay them for a data plan.
Yes. 3G is the name given to the 'wirelss network' that celluar devices use to access the internet. All wireless providers have a fee for 3G service, whether it seems so or not. Sometimes a company such as T-mobile will offer 3G as part of a wireless plan, but the price will be raised to compensate.
If you do purchase an iPad with 3G, you will not need home wireless internet. But you can also connect to a home wireless internet with an iPad with 3G. You will need to pay monthly for the AT&T 3G fees.
sorry, but you can't.
Wifi is free but if you want 3G you have to pay at AT&T.
If you disable 3G and hook it up to wifi, no, you don't have to pay.
Nope (I quite didn't get what you meant.)
Only if you use 3G, on wifi it is free, unless you pay for the wifi.
Yes but only on the mobile version. You can purchase a micro sim on pay as you go, that will provide access to the Internet.