Last year the iPhone plan included a seperate category for current ATT customers upgrading to iPhone. Simply $20 for the data plan plus whatever text message plan you're getting above and beyond the 200. I am on a family plan so I had an extra cost of $30 (data and 1500 messages). My question is come friday, can I simply plan on having my bill go up an additional $15?? Instead of $20 for the old data plan it will be $30 for the 3G data and instead of $10 for the texts, it will be $15. Or will I have to pick an entire plan and go with that. I'm hoping it will be as easy as swapping the new data for the old with the added cost. I am asking because I don't see a category for existing users.