I believe you get 10 free days if you reactivate. You have to put in your credit card information but you are free to cancel before those 10 days and you won't be charged.
Just got this from another forum
"It seems you can play the first month without having to have crysta present on your account. As soon as it sees you register a new FFXIV, you automatically get like 1399 crysta. Which pays for the first month.…