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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. Open the address book
Press the address book icon.
2. Import contacts from your SIM to your phone
Slide your finger right starting from the left side of the screen.
Press SIM card.
Press the drop down list.
Press 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.