Symbol MC9000-K/S Reference Manual page 49

For more information about SIM cards, refer to the mobile phone service
provider's documentation.
To install the SIM card:
1. Power off the mobile computer.
2. Remove the SIM housing cover on the back of the mobile computer.
3. Unscrew and remove the SIM holder clamp.
SIM Holder
Clamp
SIM
Housing Cover
Figure 1-7. Removing SIM Cover
Figure 1-8. Removing SIM Holder Clamp
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Getting Started