Im torn between which version to get. I currently have an ATT iPhone but want to check out Verizon's network, especially since Verizon's 4g LTE is available in my area and ATT won't be for a while. Question is if I buy the Verizon there is a blurb on the Apple site that says So obviously the Verizon version also has GSM compatibility...so does this mean it has a SIM slot, and if so would it work with ATT's 3G network (i.e if Verizon's 4G LTE network is not available it would be nice to stick my iPhone's ATT sim in the iPad and have it work)? Im assuming that there are two versions for ATT and Verizon solely because their LTE networks run on different frequencies, but in terms of 3G they both seem to use the same worldwide compatibility as the iPhone 4S. AFAIK the iPad cellular models are not locked so I do not see why this could not be feasible.