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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 "Settings"
Slide your finger upwards on the screen.
Slide your finger right starting from the left side of the screen.
2. Import contacts from your SIM to your phone
Press SIM card.
Press the drop down list next to "Save to".
Press the fields next to the required contacts to select them.
Press the confirm icon.
3. Return to the home screen
Press the Home key to return to the home screen.