At the moment, you can select the SIM you want to use for sending a text message in the compose box. The preference remains the same for texting a specific contact unless you change it.
This is a very convenient way to switch between SIMs when texting someone. All you have to do is tap the SIM icon in the compose box in Google Messages. For some reason, Google wants to make the process a little complicated.
Google Messages will add an extra step for switching to a different SIM when messaging. | Image Credit – Android Authority
When analyzing Google Messages version 20250209_01_RC00.phone.openbeta_dynamic, it was discovered that the SIM swap icon had been removed from the compose box. The toggle has been moved to the profile/conversation details section.
This change will require you to go to the profile/conversation details section to select the SIM for individual conversations.
While this may seem like an insignificant change with no impact on how you use the app, it might inconvenience users who frequently switch between SIMs. The app will display which SIM was used for sending a message, so at least there will be no confusion about that.
Google Messages will still let you set a default SIM for sending messages in the settings app, but if you are always switching services, you can instead require the app to “Ask every time” you text someone.
Dual SIM RCS support was added to Google Messages only recently. It might be that Google doesn’t want to clutter the compose box by displaying the SIM selector icon, which is why the setting has been moved. Regardless, if this feature ever ships, it will surely take some getting used to.
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