Pssst.Exactly. ALL phones support SMS, because ALL phones are compatible with the old but gold rock solid GSM network.
That's why and how a Nokia 3310 can call or send a text message (SMS) to an iPhone 15 and vice versa.
In other words, SMS will always be needed and will always be used, because SMS works without mobile data.
SMS is essential to and supported by all mobile phones worldwide. RCS is and will always be a dodgy niche "feature".
Not all countries support the old GSM/EDGE/HSPA bands anymore so that Nokia 3310 may not work in Canada on Roger's, Bell, nor Telus' networks as those bands got sold off for emergency services.