You can copy contacts between your SIM and phone. This way, you won't lose your contacts if you change your SIM or phone.
Slide your finger upwards on the screen.
Press Contacts.
Press the settings icon.
Press SIM Card Contacts.
Press Import.
Press Select All.
Press Import.
Press Import.
Press Export.
Press Select All.
Press Export.
Press the Home key to return to the home screen.