We've asked T-Mobile about the workaround, and we'll let you know if it can verify its authenticity and say what it's doing in response. With that said, Ajit is quick to acknowledge that his technique's effectiveness is likely short-lived at best. It'd be trivially easy for the Uncarrier to restrict access, and it won't be surprising if the hole is completely closed by the time you read this (assuming it was truly open to begin with). You'd also need the wherewithal to set up and use a proxy in the first place. Look at it this way, though: if nothing else, the stunt shows that even big telecoms make simple mistakes.