Hello, fans. I have AT&T and I'm currently on a 2GB plan leftover from embarkment onto my own phone plan. I started with the iPhone 4. Now that I'm planning on moving to a 5S from my 4S via Apple Store, I'm looking to go for broke and get the 5GB plan + hotspot option. So I think I have three options, correct me if I'm wrong: Change on AT&T.com prior to upgrading Change plan at time of iPhone 5S purchase Change plan after iPhone 5S purchase Which of these is the most seamless? I don't know if you can change plans at the Apple store, but I don't want to invite any hiccups on the 20th by screwing with my plan before hand either. Any advice is appreciated.