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If we are outside our home network, we must activate data roaming to use mobile data, and roaming must be activated to use the Oppo smartphone abroad.

Please note: This may incur additional costs, especially outside the EU!

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  SIM card & mobile data
Step 3: Choose a  SIM card   (Dual SIM)
Step 4: Enable or disable  Data roaming
  1. Tap on Settings
  2. Tap on SIM card & mobile data
  3. Choose a SIM card (Dual SIM)
  4. Enable or disable Data roaming
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Oppo Instructions