Remove the SIM holder
Insert the opener for the SIM holder into the small hole in the SIM holder at the top of your phone.
Remove the holder from your phone.
Insert your SIM
Turn your SIM so the angled corner of your SIM matches the angled corner of the SIM holder.
Slide your SIM into the SIM holder.
Slide your SIM into the SIM holder.
Replace the SIM holder
Press the SIM holder into your phone.