It seems, Samsung has delayed the One UI 5 beta program for Galaxy devices as Google has moved the official Android 13 launch to September. Meanwhile, a screenshot shared by a Reddit user shows that T-Mobile is testing the Android 21 firmware on the US Galaxy S21 Ultra.
According to the information, Checkfirm has detected a new test firmware for the Galaxy S21 Ultra smartphone (US variant). The CSC code and build version show that the build belongs to a T-Mobile branded Galaxy S21 Ultra smartphone and brings a major One UI upgrade, possibly Android 13-based One UI 5.0.
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CheckFirm is a well-known test firmware detection platform that can be downloaded from the Google Play Store. Easily, you can search for new test firmware by filling in some details like the model number of the phone and the CSC (Country-Specific Code).
Talking exclusively about the latest addition, the Galaxy S21 Ultra is running Android 13 internal testing by the T-Mobile carrier in the US. It is worth mentioning that the carrier also allows its locked variants to participate in the beta testing activity.
As you can see in the screenshot mentioned above, the build version of the new test software is G998USQU5DVG2, while the latest available build for the Samsung Galaxy S21 Ultra smartphone is G998USQU5CVDB.
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