SMS messages used to be easy to store on the SIM card, but with the latest smartphones this is usually not possible. However, in the settings you can still retrieve messages stored on the SIM card.

Android 10 (ColorOS 7.0)
Step 1:  Open the  Messages -App
Step 2:  Open the  Menu
Step 3:  Tap on  Settings
Step 4:  Tap on  More settings
Step 5:  Tap on  SIM card SMS messages
Step 6:  Choose between  SIM1  and  SIM2
  1. Open the Messages-App
  2. Open the Menu
  3. Tap on Settings
  4. Tap on More settings
  5. Tap on SIM card SMS messages
  6. Choose between SIM1 and SIM2

Oppo Instructions
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