It is currently not technically possible to make a call and use mobile data in the same network mode at the same time. 3G is used for mobile data if a call is made under 4G (LTE).

LG devices with Dual-SIM, on the other hand, have the function of using mobile data via the other, non-standard SIM card during a call, making it possible to make a call via LTE (VoLTE) and use LTE for mobile data at the same time. After the call, the mobile data is switched back to the standard SIM card.

Android 9 | LG UX 9.0
Step 1:  Open the  Settings
Step 2:  Tap on  Dual SIM Card
Step 3:  Enable or Disable  Mobile data during calls
  1. Open the Settings
  2. Tap on Dual SIM Card
  3. Enable or Disable Mobile data during calls

LG Instructions
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