How to fix unknown sim card number issue in android phones?
1. Open Settings.
2. Click on the connections button.
3. Click on the SIM Manager button.
4. Click on the more SIM settings button.
5. Click on the Dual SIM always on button.
6. Click on Enter Phone numbers.
7. Give number, click done and go back.
8. On Dual SIM always on.
This video will help you in fixing Unknown SIM card number issue.
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