Siemens CIM Operating Manual page 36

Mounting and connecting the device
4.3 Installing expansion modules
1. Pull the top housing in the marked direction to open the cover.
2. Unlock the card holder in the marked direction.
3. Put the SIM card in the card holder and then lock the card holder in the marked direction.
4. Lock the card holder in the marked direction.
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Operating Manual, 11/2022, A5E51250518-AC
CIM