Lenovo ThinkPad Edge E420s (English) User Guide - Page 110

Turn off the computer; then disconnect the ac power adapter and all cables from the computer.

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Your computer may require a SIM (Subscriber Identification Module) card to establish a wireless WAN (Wide Area Network) connections. Depending on the country of delivery, the SIM card may be already installed in your computer or will be part of the shipping contents that came with your computer. If you find the SIM cards included in the shipping contents, a dummy card is installed in the SIM card slot. Then proceed to the following instructions. If you find the dummy card in the shipping contents, the SIM card is already installed in the SIM card slot, and no further installation is needed. Note: The SIM card is identified by the IC chip mounted on one side of the card. Replacement instructions To replace the SIM card, do as follows: 1. Turn off the computer; then disconnect the ac power adapter and all cables from the computer. 2. Enter ThinkPad Setup to stop battery discharge. Refer to "Before replacing CRU" on page 75 for detailed information. 3. Close the computer display, and turn it over. 92 User Guide

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Your computer may require a SIM (Subscriber Identification Module) card to establish a wireless WAN (Wide
Area Network) connections. Depending on the country of delivery, the SIM card may be already installed in
your computer or will be part of the shipping contents that came with your computer.
If you find the SIM cards included in the shipping contents, a dummy card is installed in the SIM card
slot. Then proceed to the following instructions.
If you find the dummy card in the shipping contents, the SIM card is already installed in the SIM card
slot, and no further installation is needed.
Note:
The SIM card is identified by the IC chip mounted on one side of the card.
Replacement instructions
To replace the SIM card, do as follows:
1. Turn off the computer; then disconnect the ac power adapter and all cables from the computer.
2. Enter ThinkPad Setup to stop battery discharge. Refer to “Before replacing CRU” on page 75 for
detailed information.
3. Close the computer display, and turn it over.
92
User Guide