Updates come from Samsung, not T-Mobile. Samsung has stated they plan on updating the S8/S8+ to Oreo (Android 8) but they never actually give a release date although last year for the 7 they actually offered a public beta prior to release but again that it is all up to Samsung as they have to do the programing for each carrier's variant. The only part TMO has in the process is testing the software prior to release and approving it or rejecting it. If they reject it obviously it goes back to Samsung ot fix the issues, if they approve it then Samsung sets the release date and releases it at their discretion.
While I realize that updates come from Samsung, T-Mobile does some kind of testing and then provides to users over the air -- and I do understand that you all are kind of caught in the middle.
What spurred this question was an article that talked about testing of Android version 8.o
Having said that, however, as one of many who have the "latest & greatest" Samsung phone, am just curious as to why we haven't even gotten the intermediate update to Android version 7 -- I have version 7.0 on my phone??
If you look back at history Samsung has a history of bailing in
intermediate updates like in this case 7.0.1 I once they start working in
the next OS. One thing I have noticed though again based on history is
that even though they may not do all of the intermediate update items they
will incorporate pieces of them into updates they do put out but since it
may be not a the complete .1 update they can't call it 7.0.1.
Also once TMO approves it, it's still actually Samsung that releases the
update from their servers.
Looks like S8 Oreo beta coming out today, once out I plan on loading so
will see what security update it has
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Just downloaded the Oreo beta, security update is September 5th. If you want the beta it's only TMO and Sprint (and unlocked) but they are only letting 10K in. Just go to Samsung + app if you want it.
So far seems pretty stable.