An access point is needed to send or receive SMS/MMS on the Oppo-Smartphone. Mobile data also needs a correctly configured access point. APN data is usually configured after dialing into the network, but can also be added manually.

Android 10 | ColorOS 7.0
Step 1:  Open the  Settings
Step 2:  Tap on  SIM card & mobile data
Step 3:  Choose desired  SIM card
Step 4:  Tap on  Access point name
Step 5:  Tap on  Add
Step 6:  Set up  APN  and confirm with  Save
  1. Open the Settings
  2. Tap on SIM card & mobile data
  3. Choose desired SIM card
  4. Tap on Access point name
  5. Tap on Add
  6. Set up APN and confirm with Save

Oppo Instructions
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