Scammy telcos in poorer countries sell SS7 data for a small fee. It will give you all the location data you need.
SS7 access - you still have to hack the system to acquire the data yourself, and I believe it creates a log that you roamed to that country, and briefly disconnects your cellphone from the network? It's far from invisible.
alt Hacker News
SS7 access - you still have to hack the system to acquire the data yourself, and I believe it creates a log that you roamed to that country, and briefly disconnects your cellphone from the network? It's far from invisible.