Lenovo IdeaPad U455 - Manual (Page 52)

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Chapter 3. Using the Internet
4
Push the SIM card in until you hear a click.
5
Gently pull the SIM card out of the card slot.
6
Put the battery back in place. Turn the computer over and reconnect
the cables.
Note: Never insert or remove the SIM card while the computer is on. Doing so may
cause permanent damage to the SIM card as well as the SIM card reader.