I got an iPad 3G today. It allows you to connect to the internet through AT&T's cellular network, just like you do with an iPhone or iPod Touch. No talking though, this is just for data.
The timing was perfect, as my Comcast internet and wifi had gone out!
The 3G model costs more than the Wi-Fi only version, and you have to pay for a data plan by the month. There is no long-term "contract" though.
The 3G version also has a full GPS chip in it. I think both of these features may make it handy for travel.
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