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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.
Press the menu icon.
2. Import contacts from your SIM to your phone
Press SIM card.
Press the fields next to the required contacts.
3. Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.