Last I tried Plasma Mobile, the only password it uses is the user password. So the PIN is the user password for your user.
I don't know if they have added an option to use a shorter PIN in the last couple of years.
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Last I tried Plasma Mobile, the only password it uses is the user password. So the PIN is the user password for your user.
I don't know if they have added an option to use a shorter PIN in the last couple of years.