... from grandfathered in customers when the next iPhone comes - I've heard from a few of you here that you think AT&T will not let grandfathered unlimited data users upgrade to an LTE iPhone when it comes out. I've disagreed with this statement before and I still do today. Not only can you buy an LTE device now and keep the unlimited data you can also grandfather in unlimited data with the new iPad data plans. Sorry folks, this will not change with the new iPhone.