My bill is way higher than it should be. It says that there is a balance forward from my previous bill. what does that mean and why is it there? I did recently get a one time US plan as I went to the states in October, but I thought I had already paid for that, is it possible that it is still showing up on my phone bills? I have a samsung Galaxy S4, and my bill is usually 39.55/month, how ever this time it is 114.47. why is that?