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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 "Contacts"
Slide your finger upwards on the screen.
2. Import contacts from your SIM to your phone
Press the menu icon.
Press the required SIM.
Press the drop down list next to "Save to".
Press the fields next to the required contacts to select them.
3. Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.