If we are using Dual SIM on the OnePlus smartphone, we can rename each SIM card if, for example, both are from the same mobile phone provider.
After we have renamed one or both SIM cards to make them more easily distinguishable, the new name will be displayed instead of the provider when we make the necessary settings.

Android 10 | OxygenOS 10.0
Step 1:  Open the  Settings
Step 2:  Tap on  Wi-Fi & network
Step 3:  Tap on  SIM & network
Step 4:  Choose a  SIM card
Step 5:  Tap on  SIM name
Step 6:  Tap on the current  SIM name
Step 7:  Enter a  name  and tap  OK
  1. Open the Settings
  2. Tap on Wi-Fi & network
  3. Tap on SIM & network
  4. Choose a SIM card
  5. Tap on SIM name
  6. Tap on the current SIM name
  7. Enter a name and tap OK

OnePlus Instructions