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You can copy contacts between your SIM and phone. This way, you won't lose your contacts if you change your SIM or phone.
1. Find "Import/Export contacts"
Press the menu icon.
Press Import/Export contacts.
2. Copy contacts from your SIM to your phone
Press Import from ‹SIM card›.
Press the select all icon.
3. Copy contacts from your phone to your SIM
Press Export to ‹SIM card›.
Press Select all.
Press the confirm icon.
4. Return to the home screen
Press the Home key to return to the home screen.