> Thus a SS7 firewall would need to also support All 3 German mobile operators claim to run SS7 firewalls, so those exist. How effective those are I have no cl

> Thus a SS7 firewall would need to also support All 3 German mobile operators claim to run SS7 firewalls, so those exist. How effective those are I have no clue. Number portability to a competitor are a legal requirement in both Germany and Finland. But sending SMSes to a ported number number between those companies does not work between all operators, although calling works. Whether that is a firewall issue or yet something completely different I have no clue either. I would assume if the phone cannot receive an SMS it is also protected from a location lookup attack. But only from those networks where it doesn't work. Whether it would have worked or even still works using Fink's global titles I have no clue.