A SIM card can theoretically be inserted in the HP EliteBook 860 G9, but there are some important requirements that must be met in order to use wireless Internet via the SIM card. - WWAN adapter: Most HP EliteBooks, including the EliteBook 860 G9, have SIM card slots, but they often do not come standard with the required WWAN (Wireless Wide Area Network) adapter for mobile broadband. It is therefore necessary to check whether the WWAN adapter is installed or whether it needs to be purchased and installed separately. - Antennas and hardware: Make sure that the necessary antennas and hardware components are present in the notebook to support the mobile broadband connection. - Drivers and settings: After inserting the SIM card, the appropriate drivers must be installed and the APN settings configured in the operating system to establish the connection. Without the WWAN adapter and the corresponding settings, the SIM card cannot be used for the Internet. It is advisable to consult the user documentation or HP support to ensure that all requirements are met.