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Samsung devices use SIM card 1 for mobile data use by default. SIM card 2 can also be selected in the SIM card management. However, some Samsung devices only support fast LTE on SIM card 1.

Note: The default SIM card for mobile data can also be changed via the status bar.

Android 11 | One UI 3.0
Step 1: Tap on  Settings
Step 2: Tap on  Connections
Step 3: Tap on  SIM card manager
Step 4: Tap on  Mobile data
Step 5: Choose  SIM 1 / 2  or  OFF
  1. Tap on Settings
  2. Tap on Connections
  3. Tap on SIM card manager
  4. Tap on Mobile data
  5. Choose SIM 1 / 2 or OFF
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Samsung Instructions