I've been running my ATT unlimited iphone sim inside my new verizon ipad it for the past few hours and have not had any emails or messages. I guess when they started throttling they let up on using the iphone sims in ipads..
did you try this recently on the new verizon ipad or are you talking about the older ipad2? I've been running this for a while still. I have not been cut off or received an email..