I have always assumed that these were just throw away, burner commlinks.
Unable to be upgraded, Lowest possible construction (no matter how shiny the outside looks), and only with the most limited functions available.
Basically these are your gas station cell phones of today. Good for people who can't afford a regular Commlink, Travellers to avoid LD charges, and criminal who don't want to leave an easy data trail to follow.
And for that, you get a device that can be used by just about anyone, with no security, and stats of 1s across the board. But still good enough to leave that harassing voice message to an unloved Senator
