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You can copy contacts between your SIM and phone. This way, you won't lose your contacts if you change your SIM or phone.
1. Find "Contacts"
Press Apps.
Press Contacts.
2. Copy contacts from your SIM to your phone
Press the menu icon.
Press Import/export.
Press Import from SIM card.
Press Phone contact.
Press the menu icon.
Press Import all.
3. Copy contacts from your phone to your SIM
Press the menu icon.
Press Import/export.
Press Export to SIM card.
4. Return to the home screen
Press the Home key to return to the home screen.