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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 "Fix & manage"
Press Fix & manage.
2. Import contacts from your SIM to your phone
Press Import from SIM.
Press the required SIM.
Press the drop down list next to "Save to".
Press the fields next to the required contacts to select them.
Press Keep to keep the existing contacts on your SIM.
Press Remove to delete the existing contacts from your SIM.
3. Return to the home screen
Press the Home key to return to the home screen.