iMessage is an Apple closed ecosystem that allows other Apple users to communicate with each other. This is done by using the Messages app on either the phone, tablet, or computer. iMessage is very much like RCS, but existed before RCS, and is a closed loop. Late 2024, Apple has decided to support RCS as long as the carrier provided the infrastructure to support the backend. The link to my telephone will open the Messages app if you are using an Apple product to read this page. Your message will send as a “blue” bubble. Android users will also be able to use the link to send via RCS or SMS.