Re: Well GSM was designed in the 1980s...
@Christian Berger: my understanding is there are various grassroots efforts going on today specifically to address this issue of cellular base station hacking / rogue base-station operation - often named for the devices most famously used to perpetrate this, the "Stingray" from US company Harris.
Including efforts by the platform vendors to include methods of detecting such rogue base stations right from the native mobile OS itself.