Removing A Sim Card; Sim Cards That Require A Pin To Unlock Sim Before Use - Multitech MTD-H5 User Manual

Removing a SIM Card

To remove a SIM card:
Warning: If the device is connected to a computer or power supply, disconnect it. Inserting or removing a SIM
card with the device powered may harm the SIM card and the device.
Remove the SIM cover from the back of the device. If you have trouble sliding the SIM cover, use a flat-blade
screwdriver in the slot on the SIM cover to slide it out.
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Slide the SIM card out.
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Replace the SIM cover.

SIM cards that require a PIN to unlock SIM before use

AT+CPIN=XXXXX is the command to set and read the PIN used for the SIM card. Entering an invalid PIN or entering
a PIN for a SIM that doesn't require one could cause the SIM to become locked. Typically XXXX failures while trying
to enter the SIM PIN may lock the SIM.
6 QuickCarrier USB-D MTD-H5 and MTD-EV3