Sony VAIO VPCX128LG Operating Instructions - Hardware Manual page 54

Using Your VAIO Computer >
Using the Wireless WAN
To insert a SIM card
1 Turn off your computer.
2 Remove the battery pack from the computer.
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For detailed instructions, see To remove the battery pack
3 Remove the SIM card (1) by pushing it out from the base plate.
(page 21).
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