The wonderful new iPad Wi-Fi + 3G are being sold like hotcakes and one question people are still asking is how to set up their magical new device with the not-so-magical AT&T and their cellular data plan. Here is a brief overview:
To set up your iPad Wi-Fi + 3G to use AT&T’s cellular network, assuming you have already set up the iPad itself, go to your iPad’s Settings app and select Cellular Data from the list to the left (as seen in Image 1).
Image 1: "View Account" takes you to Image 2 (if you've already set up your account, otherwise it gives you a screen where you choose login info, enter a CC number, and pick an initial plan). The "View Account" is also how you set up your account the first time.
Image 2: Log in using the credentials you selected when you signed up.
Image 3: You can see your stats and choose to modify plans. Clicking "Add Data or Change Plan" takes you to image 4.
Image 4: You can see the plan options.
You can upgrade if you think you need more time or downgrade your plan if you think that you’re not using 250 MB in a month (reset your data stats monthly to track usage).
An important thing to consider with the 250 MB plan is that if you are going to be watching a couple of videos a week or downloading content via 3G and not over the Wi-Fi you will reach your data cap before your 30 days are up. You will receive a message from AT&T when you’ve passed 80%, 90% and then at 100% of your data cap. You can then renew for another 250 MB for 30 days, or which ever comes first.