Hello let me introduce myself, my name is John Ward and, I've been involved with many aspects of the computer & electronics industry since 1979, and have worked with several Open GTS installations including writing Device Communications Servers (DCS) for trackers..
I'm sure I can make this happen and, you are correct you will need a SIM card and, a few other "pieces" will also need to be installed in the equipment.
Please have a look at the resume portion of my profile and, my message in the PMB
Regards,
John H. Ward, Jr.