Later next year, we will be adding support for RCS Universal Profile, the
standard as currently published by the GSM Association. We believe RCS
Universal Profile will offer a better interoperability experience when
compared to SMS or MMS. This will work alongside iMessage, which will
continue to be the best and most secure messaging experience for Apple users.
https://9to5mac.com/2023/11/16/apple-rcs-coming-to-iphone/