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What are the Ipad 4 carrier requirements?

I am thinking about updating my iPad 1 to a 4. I am currently on ATT. Based on the rate plans I prefer to stay on ATT at this time; however, I am not sure that I will always feel that way. I have seen some information stating the 4 can be used on multiple carriers. I also saw that to do this I have to buy the Verizon one as it can have a micro sim added to it for ATT but not the other way around. Is this true? If I get a Verizon Ipad 4 will I have full access to ATT once I add a micro sim to it? Also, where can I find that information or where did you get your sources from? Thanks!

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