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You can import your contacts from your SIM to your phone. This way, you won't lose your contacts if you change your SIM.
1. Find "Contacts app settings"
Slide your finger upwards on the screen.
Press the profile icon.
Press Contacts app settings.
2. Import contacts from your SIM to your phone
Press the required SIM.
Press the drop down list next to "Save to".
Press the fields next to the required contacts to select them.
3. Return to the home screen
Press the Home key to return to the home screen.