FadeToBlack&Gold
8647
I didn't know anyone *made* pagers anymore, encrypted or no.
One-way pagers are still very much in use for their simplicity and reliability. Physicians and first responders can use them when cellular networks are down, and to cut down on the distraction from constant notifications and robocalls on a cell phone. They can also be used in places where cell phones are prohibited, like SCIFs and prisons.
Terror groups likely would use them because they don't utilize cell networks and therefore cannot have the wearer's location quickly triangulated by law enforcement.