I am currently shopping on Craigslist for a used 64GB Ipad 2 with 3G. The prices vary, to as low as $450, but this seems to be a suspicious price; perhaps hot goods. Anyway, my question is about the difference between AT&T and Verizon ready Ipad. I travel often and imagine that one day I will land in a country where I will want to buy a local SIM card to use in my Ipad. Is this possible to do with both versions of the Ipad? I assume that the Verizon edition does not have a SIM slot, right? Also, are these Ipads unlocked, unlike the Iphone that Apple sells in the US? Thanks in advance for your answers.