Where is the sim card slot on Dell 7722 laptop [Closed]

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On a Dell 7720 laptop, where is the sim card slot???
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I under the back cover. This is a link to more information:

https://www.laptopmain.com/dell-precision-7720-disassembly-ssd-hdd-ram-gpu-upgrade-options/
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Are talking for MObile networks, or flash RAM?