How to React to Texts with Emojis Using Android RCS Messaging

You can like and react with emojis to text messages on Android phones using RCS messaging.
To like a message, tap and hold it in the Google Messages app and choose the thumbs-up emoji.
You can change your reaction by tapping the existing one and picking a new emoji.
Both you and the sender need RCS enabled to use reactions. Turn it on in Messages Settings.
If reactions don't work, make sure you and the sender have RCS messaging enabled on your devices.

howtogeek.com

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