Sorry that errors giving you trouble. Where are you getting it? Are you using the T-Mobile app or logging into your account online and having trouble? Please let us know we can help. Thanks!
It sounds like you're trying to access your My T-Mobile account when you encounter this error. Our Customer Care team will need to take a closer look at your login. Please Contact Us to get that taken care of. If you're just wanting to know how much data you've used, you can dial #WEB# (#932#) to find out. Here are other short codes you may find useful.