From other articles I have read, the S6 updates are not the same as the Note 5. S6 update is a LOT bigger in size and includes Advanced messaging, where Note does not include Advanced Messaging. Advanced messaging is what I'm waiting for to get rid of using third party apps for MMS and send uncompressed images.
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I have now my friend's S6 edge besides my Note 5 and both settings in the Default messaging app looks almost identical with the exception of having different labels on the Block messages options and the Note 5 having in the More Settings options, the Split View feature that the S6 / S6 edge don't have. But in Chat settings both are identical with same 'Share typing indications", Multimedia limit (9765MB) and Send read receipt options, plus earlier today I sent my friend a 20 seconds video of about 7MB and she received it without compression, so yes, I'm almost sure that Note 5 also got the Advance Messaging update with today's option.
BUT, with that said, I can't find a way or simply don't know how to begin a chat conversation, I mean I select my contact and there is no option for a chat or something different, and no matter what I send it always gets as just an SMS or MMS, so maybe T-Mobile hasn't turned on all features yet or I'm obviously missing something , remember, I just came back from more than a year of just using Textra, so I can't say that I'm a master on this message app, so can somebody check this and see if I'm doing something wrong?