Follow the procedures in Before Working Inside Your Computer.
Ensure that your work surface is flat and clean to prevent the computer cover from being scratched.
Turn off your computer (see Turning Off Your Computer).
Removing the Micro Subscriber Identity Module (SIM) Card:
Remove the battery.
Slide the micro SIM card out from the slot .
Installing the Micro Subscriber Identity Module (SIM) Card:
Push in the micro SIM card into its slot.
Install the battery.
Follow the procedures in After Working Inside Your Computer:
Connect your computer and all attached devices to their electrical outlets.
Turn on your computer.