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FIBOCOM NL668-EAU-MiniPCIe-10 Hardware User Manual
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recommend using hot plug slot with (U)SIM card detect function.
Figure 3-7 (U)SIM Card Slot Diagram SIM016-8P-220P
Figure 3-8 (U)SIM Interface with Card Detection Reference Design
Principles of (U)SIM card connector with card detection signal are as follows.
(U)SIM card plug in, USIM_PRESENCE is high level.
(U)SIM card plug out, USIM_PRESENCE is low level.