You can import your contacts from your SIM to your phone. This way, you won't lose your contacts if you change your SIM.
Slide your finger upwards on the screen.
Press the menu icon.
Press Merge and fix.
Press Import from SIM card.
Press the drop down list next to "Save to".
Press the fields next to the required contacts.
Slide your finger upwards starting from the bottom of the screen to return to the home screen.