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Third-generation cellular networks are exposed to novel forms of denial-of-service attacks that only recently have started to be recognized and documented by the scientific community. In this contribution, we review some recently published attack models specific for cellular networks. We review them collectively in order to identify the main system-design aspects that are ultimately responsible for the exposure to the attack. The goal of this contribution is to build awareness about the intrinsic weaknesses of 3G networks from a system-design perspective. In doing that we hope to inform the design practice of future generation networks, motivating the adoption of randomization, adaptation and prioritization as central ingredients of robust system design.