I was searching around and it seems the plan has long been disconnected. Just wonder if there's still anyway to get an unlimited data plan? Is the only way to buy someone's old SIM with unlimited plan on it? Thank you very much!
Yes, the plan has been discontinued. Only way to get it would be for someone who has it to give you their sim card along with their account credentials, unless you can sweet talk someone at AT&T to give it to you.