Hi:
Every EliteBook as a SIM card slot.
What 90% of them don't have is the WWAN networking adapter that is needed to access the cellular service.
It was an expensive option.
In order to use the SIM card, one of the following WWAN adapters needs to be present under the Network Adapters device manager category...
HP hs3110 HSPA+ Mobile Broadband Module
HP lt4111 LTE/EV-DO/HSPA+ Gobi Mobile Broadband Module
HP lt4112 LTE/HSPA+ Mobile Broadband Module
