At its core, is not a separate operating system version like "Pro for Workstations." Instead, it is a pre-configured licensing SKU (Stock Keeping Unit) that combines Windows 10 Pro with extended mobile broadband capabilities.
Different developers release various versions of these packs: windows 10 pro gsm pack
On newer Windows 10 Pro builds (Version 1709 and later), the GSM Pack includes eSIM management. At its core, is not a separate operating
Here is the critical point for enthusiasts: At its core
Removing carrier locks from smartphones.
Since the GSM Pack is software built into Windows 10 Pro, there is no direct license fee. However, the "cost" comes from the hardware premium and the data plan.