In 2009, I ordered the 3GS from Apple. I wasn't prompted to select a data plan at the time of purchase. So when I received the 3GS, which was purchased on my mom's account upgrade, I inserted my 3G sim, then activated the 3GS through itunes. I'm concerned if this might not work this time around because I must select a data plan during the purchase. I'm also concerned because of the note on AT&T's website that states the following: "You must maintain a minimum $15 per month data plan for as long as you have a voice plan with this phone." 😕
But it sounds like I'll be able to handle it all through AT&T. Thanks for the upgrade swap link, nszzya! 🙂
p.s. I'll be using the micro sim that came with my first iphone 4, which [the sim] is currently scotch-taped to a piece of plastic to fit into my old 3G. For those wondering, I tried to replace the cracked screen on my first iphone 4, and...it didn't go so well. I ended up tearing the digitizer ribbon cable on the replacement screen, then did the exact same thing when trying to put the cracked screen back on. So the sim i put in the new iphone 4 (hopefully the iphone 4 will be white,) i'm hoping i'll have the same ease of activating what will essentially be of a replacement iphone 4.