TorPEDO is the most concerning attack that leverages paging protocol, allowing remote attackers to verify a victim device’s location, inject fabricated paging messages, and mount denial-of-service (DoS) attacks. ToRPEDO attack impacts both 4G as well as the current version of 5G LTE protocol. PIERCER and IMSI-Cracking attacks also opens a door for two other new attacks, leading to the full recovery of the victim’s persistent identity (i.e.IMSI)
Source: https://thehackernews.com/2019/02/location-tracking-imsi-catchers.html