[Galaxy Note 4 General] GidiK:
Like my fellow countrymen [MENTION=1586120]henklbr[/MENTION] and [MENTION=650794]marleyb[/MENTION] on the VodafoneNL network, I was experiencing the "texting just got better" messages after every restart. See this post. So I tried to find out what was going on. Short story: it goes away if you flash this rom a second time.

This release from Samsung is actually a multi-CSC release. Included CSCs are:

DBT (Germany)

BTU (UK)

CPW

ITV (Italy?)

KOR

XEF (France)

XEO

If your Note4 is of one of those CSCs, you don't need to wait for your update; this is it. Also, when you flash this, the installation procedure for your CSC will run, so BTU people will stay on BTU and have the BTU actions performed (I understand that from other posts in this thread). It looks like the install actions for all CSCs are very similar, with the addition for DBT that installs two German apps. This is why people in the UK don't report seeing those German apps.

The install actions all CSCs have in common is the removal of three IMS* apps (one for settings, two services). These are for a messaging service that is related to the "Share with contacts" menu feature that was removed before release. The three supporting apps for that feature are still included but get removed during the CSC install actions. It seems likely that these IMS* services respond to the fact that the VodafoneNL network supports the RCS (Rich Communication Services) by showing the initial "Texting just got better" message.

People of the above regions will not see the message, because during their CSC install the IMS* apps got disabled. Some people outside these regions will not see the message if their network doesn't have RCS.

If you have a different CSC (e.g. PHN like me), the CSC install actions don't run properly. The end results is a phone that half reports itself as DBT, has the extra German apps, but the IMS* apps are not disabled.

However, after a while (I did restarts, also into recovery and at some point also a factory reset, I don't know what triggered it), I noticed that my phone reported itself as fully DBT. You can see this in recovery and in Kies. E.g. in Kies I initially saw one line of firmware version information but later the usual two:

At this point the phone has become a proper DBT phone. Reflashing the rom with Odin makes it go through the real DBT install procedure. Which means that the IMS* apps are deactivated. And the message never appears again... So if you are plagued by that message: check whether you have the two DBT lines in Kies and if so, reflash this same ROM with Odin.

BTW I had confirmed first that none of my messaging apps caused this message, by disabling them one by one.

Some other observations after reading several posts of this thread and after factory reset: BBC media player works fine on lollipop; the wifi is indeed very unstable (you need to uncheck the automatic network switching); sometimes Contacts crashes. Other stuff was solved with the factory reset: occasional blank screens, play services failing to update, repeated reinstall of one of the knox apps 'new registration', etc. Overall it works fine and I love some of the new features like trusted places, lockscreen notifications, etc.