Default sim unlock for ZTE Avail 2 z992?

what is the easiest method to finding the unlock code for my device?

z992

android 4.1.1

baseband w8yA

build # z992v1.0.0b11

im sorry if that has been answered, im sort of in a panic between phones and i need it unlocked from at&t by tomorrow morning for work. called them earlier today, they told me it'd be 3-5 days till they can give me the unlock code. as a pizza delivery guy thats not an option. any help is so totally appreciated.