Can't you also track and read messages, mobile data and calls that are send and received from the mobile device?
An IMSI catcher is nothing but a 'fake' cell phone tower for a phone.
An IMSI catcher is nothing but a 'fake' cell phone tower for a phone.
Likely with a semi-busted protocol, depending on whether we're talking GSM/CDMA/LTE/etc, but a pain to attack, regardless.