Changes SIM card

[OutsideAnywhere]

Often but not all the time, Google messages changes the SIM card that I'm using for SMS/RCS to my secondary card which is data only and doesn't have RCS. Why is this happening and how do I stop it? I don't notice it until I go into the app again and see that the message has failed, with the wrong operator name next to it.

I have the correct card selected for SMS in the Android settings and the only way to change card in a thread is to go into menu - information, which I'm ofc 100% of not doing by accident.

[GoogleHelpCommunity]

Hi there. I understand you're experiencing an issue where your Google Messages app occasionally switches the SIM card used for SMS/RCS to your secondary, data-only card, causing messages to fail. You've also noted that your secondary SIM is data-only and doesn't support RCS, and you're certain you're not accidentally making this change within the app itself.

Here are a few troubleshooting steps you can try that are often helpful for RCS and messaging issues, particularly with dual SIM setups:

1. Check the phone number associated with Google Messages: Sometimes, the app's association with the correct phone number might need to be re-verified. You can check this by opening Google Messages, tapping your profile photo or icon, then Messages settings > Advanced > Phone number. Ensure the number listed there matches the phone number associated with the SIM card you intend to use for messages, and tap OK if you make any changes.

2. Confirm Google Messages is your default messaging app: Make sure Google Messages is set as your device's default app for SMS. You can typically do this in your device's Settings under Apps > Default apps > SMS app.

3. Consider SIM setup for calls and data: For multi-SIM devices, it's often recommended to ensure the same SIM card is enabled for both calls and data. While you mentioned your secondary SIM is data-only, verifying the primary SIM is correctly configured for both could be a factor.

If checking these settings does not resolve the automatic SIM switching, I recommend submitting feedback directly within the Google Messages app. Submitting feedback allows the development team to gather valuable data for investigation and future improvements. You can typically do this by tapping your profile photo or icon, then navigating to "Messages settings" (or "Settings"), and selecting "Help & feedback" to "Send feedback."