It looks like things are getting more complicated now because Apple has since released a statement to 9to5Mac in which they are refuting T-Mobile’s claims. The company says that none of their carrier partners have blocked the feature, and that they have not made any changes in iOS 15.2 that would prevent the feature from working.
According to Apple, “No changes were made to iCloud Private Relay in iOS 15.2 that would have toggled the feature off. Users are encouraged to check their Settings to see if Private Relay is enabled on their device or for a specific network.”
T-Mobile has also since sent an updated statement where they suggest that the issue could lie with the Limit IP Address feature. “We wanted to update what we shared earlier. Apple doesn’t change customers’ settings when they update to iOS 15.2. Customers may see an error message if they previously toggled iCloud Private Relay or Limit IP Address Tracking off in their Cellular Data Options Settings. Apple has more details on their support page for this feature here.”
For T-Mobile users who might be affected, you can head on over to Apple’s support page to find out how to possibly fix the issue on your end.