The un2420 is internally a chip. You can use generic Gobi 2000 drivers for Windows 10 from third-party sources (e.g., from Samsung or Lenovo laptops with similar modules).
However, as 3G networks sunset worldwide, the practical utility of the un2420 is diminishing rapidly. Use this guide as a stopgap measure while you plan a hardware upgrade to an LTE or 5G module. For retro-computing enthusiasts, though, seeing that “Connected” status on a 15-year-old EliteBook running Windows 10 is a satisfying victory. hp un2420 mobile broadband module driver windows 10