Just a heads up for those who doesn't have unlimited data. I was being charged for roughly 210MB (I'm on 2GB plan) from the last billing cycle. I knew something is wrong there since this is only the 2nd day of new billing cycle, so I checked the history under my account and I see these little sneaky bastards from last bill. They told me it's a system error and they are going to fix it after I chatted with a rep. Finger crossed here.