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.
That's not possible, You can only Use the Internet on Wi-Fi or Wi-Fi and 3G on 3G Models of the iPad.
That depends on what you are planning to use the iPad for. An iPad Wi-Fi with 3g has both Wi-Fi and 3g connectivity, whereas the iPad with Wi-Fi only has Wi-Fi connectivity. 3g connectivity allows you to connect to the Internet through wireless carrier's 3g network, while Wi-Fi allows you to connect to the Internet through nearby Wi-Fi networks.
The iPad comes in two versions: a Wi Fi only version and a WiFi + 3G version. If you only need to use the iPad at home then the Wi Fi version will connect to the Internet via your home network. If you plan to use the iPad out of the home then you will need the 3G version (unless you limit your usage to cafes and stores that provide a free Wi Fi connection) to connect to the Internet. In the US the only 3G option is currently with AT&T.
I own the iPad Wi-Fi model. There are two different models. There is the iPad Wi-Fi model and the iPad Wi-Fi +3G model. The difference with 3G is its supposed to be faster. And the most convenient thing with an iPad Wi-Fi + 3G model is that you can access the internet wherever you go without having to connect to Wi-Fi.
The iPad comes with it's own internet browser called safari. It can be used in Wi-Fi hotspots and anywhere if you have a 3G plan for a 3G iPad.
With WiFi or a 3G connection.
. Yes...How?
If you buy the wifi and 3G one you can.
Ipad or Ipad WIFI can access WiFi network ( like Ipod touch) where as IPad 3g has SIM card slot and can access internet where WiFi networks are not available ( you require Data Plan from AT&T in US) for Ipad 3G if you want to access internet where WiFi network is not available. What happens if you cancel the monthly payment on the Ipad 3g, does it still work?
Yes
You can use wi-fi on any home internet service provider- for ever! But if you want to use the iPad on the go with 3G, you have to subscribe with AT&T (as of right now).