Sony VAIO VPCX11 - Manual (Page 55)

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Using Your VAIO Computer >
Using the Wireless WAN
4 Insert the SIM card into the SIM card slot with its printed circuit side up.
!
Do not touch the printed circuit on the SIM card. Be sure to hold your computer firmly before inserting or removing the card.
Do not damage the SIM card in any way, either by bending or exerting pressure on the card.
5 Reinstall the battery pack.
!
Make sure the battery pack is installed properly.