So, I have an iPhone. Its great, I love it, its battery sign isn't working, but Apple said its software only. Either way, I'm loving this phone! However I also have a BlackJack from AT&T, a decent phone. Does a few things iPhone doesn't, so I'm planning on keeping it. I know the SIM card from my iPhone works in the BlackJack for phone call, but does the data plan? Will AT&T know that I'm using the BlackJack with data, and charge me for a non-iPhone plan(the 1kb/1cent)? Do they even care? I'm planning on downloading AIM for the BlackJack, will the be able to see that?