Their entire site is a really bad example of ASP.NET development. As someone who knows the technology well, it can make great sites. It just rarely does.

I like my T Mobile service but there's something odd with their backend systems and/or customer service. I logged in to disable their "WebGuard" service that seemed to be blocking pages at random. It required address and social security verification, but I couldn't get it to verify my details.

I called, and the customer service agent hopefully told me that my address didn't exist. I live in the middle of New York, and I've never had this issue before. I can't help but wonder what crazy verification system they're using.