A good indicator is how expensive SMS was back when smartphones were brand new.
If they were expensive, users jumped ship right away. If they were nearly free, people just kept using them on brand new devices as there were no compelling enough arguments to switch.
To answer your question more directly, Sweden comes to mind.
I’m not sure where you are, but when I first got a phone in maybe 1998 SMS was completely free. No concept of limits at all. It was only when it became popular that network operators started charging for them. Now nobody uses them for anything except receiving 2FA codes
If they were expensive, users jumped ship right away. If they were nearly free, people just kept using them on brand new devices as there were no compelling enough arguments to switch.
To answer your question more directly, Sweden comes to mind.