I know this can be done but I can't find anywhere that actually tells you the exact settings. This is what I want to do: http://wowmobi.net/iphone/iphone-news/you-can-use-an-att-sim-card-in-a-verizon-ipad/ It just says apply your AT&T apn settings?! What are those and how do I do this. Anybody with knowledge about this I would be super grateful!!!!!!!