^^ they state it as unlimited, but when you get to 80% they send you a text message to notify you. im assuming it is around 1GB-2GB monthly usage. and going over the allowance is considered as not complying with the fair usage policy that t-mobile has in places, which ultimately leads to them slowing your connection speed down during the daytime when people use it most. in the middle of the night remainds the same, when most likely you will be asleep.