Oppo How to Set Default SIM card for Calls
Oppo 3556
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If two SIM cards are inserted in the Oppo Smartphone, the default SIM card can be determined for calls, and the defined SIM card is used for outgoing calls.
Android 11 | ColorOS 11.0




- Tap on Settings
- Tap on SIM card & mobile data
- Tap on Calling
- Choose SIM1/2 or Always Ask