The inability to use message reactions on Android devices stems from a complex interplay of factors related to messaging protocols, carrier support, and the specific messaging application being used. Certain messaging standards, such as SMS/MMS, lack native support for reaction features. Consequently, when an iPhone user reacts to a message sent to an Android device using these protocols, the reaction is typically delivered as a separate text message, which can be disruptive and lacks the intended interactive experience.
The availability of advanced messaging features, including reactions, relies heavily on the adoption of Rich Communication Services (RCS). RCS is intended as the successor to SMS/MMS, offering enhanced features such as read receipts, typing indicators, and, importantly, message reactions. The widespread adoption of RCS promises a more seamless and consistent messaging experience across different operating systems. However, RCS deployment is dependent on carrier support and user adoption, factors that have historically hindered its universal availability. The standardization and implementation of RCS is an ongoing process aimed at creating a more unified messaging ecosystem.