If you change your SIM and would like to keep contacts saved on the SIM, you can import your contacts to your mobile phone address book. as it saves you from keying in all the information again.
Find "import from SIM"
Back up contacts to your mobile phone
Return to the home screen
Tap the dots in the bottom right corner of the display.
Tap import from SIM.
Tap the Home key to return to the home screen.