Attacking a cell phone is different in some ways from attacking a subway system though. The cell phone's defenses are effectively 100% automated, and the attac

Attacking a cell phone is different in some ways from attacking a subway system though. The cell phone's defenses are effectively 100% automated, and the attacker can buy a perfect copy of their intended target's phone to and safely try out an indefinite number of attacks on this copy until that attack is perfected. Once the attack is ready it can be deployed with very little exposure to the attackers. If the attack doesn't work, the attackers are unlikely to be discovered and you can make another attempt. Attacking a subway system in comparison, the planning will be done based on diagrams and theory, the attackers only get one attempt, many of the defenses will be unknown, the target environment is highly unpredictable, includes human defenders, and even if successful the attackers will likely either die or spend the rest of their lives imprisoned.