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Oppo

Oppo: Set the Default SIM Card for Mobile Data

If your Oppo keeps using the wrong SIM for internet access, calls and data can end up split across two different cards without you noticing. This gets expensive fast when the non-preferred SIM has no data plan or triggers roaming charges. Switching the default data SIM tells the phone which card to use for every mobile data connection going forward.

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Android 11 · Coloros 11
Set Default SIM for Mobile Data – Coloros 11: step 1 – Tap on Settings
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Oppo

Set Default SIM for Mobile Data auf Oppo

On dual-SIM Oppo phones, calls and mobile data can each be assigned to a different SIM card. If the data SIM was never set explicitly, ColorOS may keep using whichever card was active first, even if that SIM has no data plan or is roaming.

The setting responsible for this lives under mobile data management, separate from the call SIM setting. Changing it does not affect which SIM handles calls or SMS, only which card the phone uses for internet access.

How to change it

Open Settings ➔ SIM card & mobile data ➔ Mobile data ➔ Choose SIM 1/2 and select the card that should handle internet traffic.

After the change, the phone re-searches for a network on the newly selected SIM. This can take a few seconds and briefly interrupts an active data connection.

If mobile data still is not working after switching, check that the selected SIM actually has an active data plan and that mobile data is toggled on for it. A missing plan or a disabled data toggle looks identical to a wrong SIM selection.

Frequently asked questions

No. The call SIM and the data SIM are set separately in ColorOS. Changing Mobile data only affects internet traffic, not voice calls or SMS.

Compatible devices

Tap your device — opens its hub with matching guides.

Android 11 · Coloros 11

Oppo A15Oppo A37Oppo A5Oppo A52Oppo A54Oppo A54 5GOppo A54sOppo A55 5GOppo A56 5GOppo A59SOppo A72Oppo A73Oppo A93 5GOppo A93s 5GOppo A94 5GOppo A95 5GOppo AX5Oppo F15Oppo F19Oppo F19 ProOppo F19 Pro+ 5GOppo Find 7Oppo Find 7aOppo Find X2Oppo Find X3Oppo Find X3 ProOppo K9Oppo Mirror 5sOppo Neo 7Oppo R11 PlusOppo R7 PlusOppo Reno 6 5GOppo Reno4Oppo Reno4 ProOppo Reno5 ProOppo Reno6 4GOppo Reno6 Pro 5GOppo Reno6 Pro+ 5G

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