For dual SIM devices from LG, a standard SIM card must be selected in addition to the regular setting for mobile data.

When the mobile data is switched on, the last stored SIM card is automatically used. The default SIM card can be changed in the dual SIM settings.

Android 9 | LG UX 9.0
Default SIM card for mobile data -  Open the  Settings
Default SIM card for mobile data -  Tap on  Dual SIM Card
Default SIM card for mobile data -  Tap on  Mobile data
Default SIM card for mobile data -  Choose between  SIM card 1  and  SIM card 2
  1. Open the Settings
  2. Tap on Dual SIM Card
  3. Tap on Mobile data
  4. Choose between SIM card 1 and SIM card 2

LG Instructions
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