The Android 8.0 Oreo beta test program for the Galaxy S8 and Galaxy S8+ has concluded in every market that it was launched, meaning Samsung has the final code required to roll out the official update ready to go. For those using carrier-locked variants, an update doesn't hit the air until it goes through the necessary certifications from their carrier, and at least T-Mobile in the US has now begun testing Oreo for the S8 and S8+.
This is another hint that the Oreo update could soon hit unlocked models of the S8 and S8+, and a pretty big one at that, as carriers usually begin testing a major upgrade after development on the base software has been completed by the device manufacturer. Of course, we could just be reading too much into the whole thing, but that's not hard to do when anticipation for the Oreo update is at an all-time high. Not to mention Samsung had previously said it is trying to release Oreo for the S8 and S8+ by the end of January, even though it later changed its tune to remove mention of an ETA.
Galaxy S8 Oreo update: Which North American carrier will be first?
Coming back to T-Mobile, the carrier has updated its support pages for the two phones to say that Android 8.0 Oreo is under testing. As expected, that's all the support pages say at the moment, and there is no telling when North American carriers will start updating the S8 and S8+ to Oreo. It also remains to be seen which carrier will be the first to do so. While you're waiting, don't forget to check out how you can prepare your phone for Oreo, and also see everything the new version of Android brings to Samsung's devices.