Below are some device-specific tips that we've collected. If these steps don't match what your phone is displaying, it's best to consult your device's manufacturer.
You can choose which number your iMessages are sent from by going to Settings > Messages > Send & Receive > pick the phone number you want to send iMessage from.
To pick your default SIM for texts, tap Settings > Network and internet > SIMs > choose the SIM you would like to manage the call settings for > SMS preference > pick the SIM you'd like to use.
To pick your default SIM for texts, tap Settings > Connections > SIM card manager > scroll down to 'Preferred SIM card' and select your preferred SIM for messages
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