- A chat theme customization feature appears to be rolling out to the Android SMS/MMS/RCS client app, “Google Messages.”
- Analysis of the app file for the Android “Google Messages” update v20260515_00_RC00 (messages.android_20260515_00_RC00.phone.openbeta_dynamic) reveals the addition of resource code related to chat background color and theme customization (Change colors / Choose theme).
- Since the code specifies “Can’t change theme without RCS,” it appears this feature will be limited to “RCS (Rich Communication Services)” chats.
It appears that a chat theme customization feature will be arriving on the Android SMS/MMS/RCS client app, “Google Messages.”
We have confirmed the potential for this feature through our original “App Analysis” series.
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After analyzing the app files from the “Google Messages” for Android update v20260515_00_RC00 (messages.android_20260515_00_RC00.phone.openbeta_dynamic), released on Monday, May 18, 2026, we confirmed the addition of resource code related to chat background color and theme customization (Change colors / Choose theme). Given the string “Can’t change theme without RCS,” it seems this background color and theme customization feature will be exclusive to “RCS (Rich Communication Services)” chats.
<string name="custom_theme_plugin_title">Change colors</string>
<string name="custom_theme_tombstone_change_link_disabled_toast">Can't change theme without RCS.</string>
<string name="choose_theme_pref_key">choose_theme_pref_key</string>
<string name="choose_theme_pref_title">Choose theme</string>While we have not yet observed this background color and theme customization feature for RCS chats in the “Google Messages” app, it is expected to be rolled out in stages—likely via a beta or test version—as soon as it is ready.
Google Messages App Link
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