Below are some device-specific tips. If these steps don't match what your phone is displaying, it's best to consult your device's manufacturer.
iPhone
To pick your default SIM for data, tap Settings > Mobile > Mobile Data > select the SIM you'd like to use data with.
Google Pixel
To pick your default SIM for data, tap Settings > Network and internet > SIMs > pick the eSIM you'd like to manage settings for > toggle 'Mobile data' on.
Samsung
To pick your default SIM for data, tap Settings > Connections > SIM card manager > scroll down to 'Preferred SIM card' and select your preferred SIM for mobile data.
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