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.
Slide your finger right on the screen.
Press the required SIM.
Press the fields next to the required contacts to select them.
If you want to keep existing contacts saved on your SIM, press Keep.
If you want to replace existing contacts saved on your SIM, press Remove.
Press the Home key to return to the home screen.