Taiwan Conducts First Mobile Internet Throttling in Civil Defence Drills

Taiwan will deliberately throttle mobile internet speeds for the first time during its annual civil defence exercises on Aug. 10 and Aug. 13, 2026, simulating a major connectivity slowdown to test communications resilience under disaster or attack conditions Focus Taiwan. Taipei mobile phone users received an emergency push alert during the week of Aug. 10 warning of the impending internet slowdown drill Wall Street Journal.

The nationwide Urban Resilience Exercises and air raid drills are scheduled across two dates, Aug. 10 and Aug. 13, 2026 Focus Taiwan. The inclusion of mobile internet throttling marks the first time Taiwan has incorporated a deliberate network speed reduction into its civil defence exercises Reuters.

The drills build on a broader framework established by Taiwan's Ministry of Digital Affairs (moda). In March 2024, moda published a press briefing titled "Results of the Program to Strengthen National Communications Network Resilience," detailing response measures for scenarios where the domain network is damaged or a large-scale internet outage occurs during extreme or emergency situations moda.gov.tw.

Moda conducts regular cyber attack-defense drills covering social engineering, live exercises on information and communication systems, and distributed denial-of-service (DDoS) attack simulations, targeting Class-A public agencies and central government bodies moda.gov.tw. In fiscal year 114 (2025), these drills covered 71 Class-A agencies and identified 442 potential risks in their information systems moda.gov.tw.

The communications network resilience program also addresses vulnerabilities in submarine cable infrastructure. According to moda data, roughly 80% of submarine cable outage causes over the past five years were attributable to human factors, including anchor dragging, fishing operations, and sand dredging. About 20% resulted from natural aging and other causes moda.gov.tw.

Taiwan's National Communications Commission (NCC) has been monitoring international infrastructure threat patterns through its international communications industry observation platform. A November 2023 NCC report noted that UK national infrastructure faces long-term and significant threats spanning communications, safe drinking water, electricity, transport, financial networks, and internet connectivity, amid increased cyber activity and persistent geopolitical challenges NCC.

Looking at what this means for Taiwan's resilience posture, the move to incorporate live internet throttling into civil defence exercises shifts the focus from passive infrastructure hardening to active stress-testing of societal and operational adaptation. Previous moda efforts centered on identifying vulnerabilities in government systems and building contingency protocols for network disruption. The August 2026 drills extend that logic into the civilian domain, testing whether the public, emergency services, and local government operations can maintain functionality when connectivity is degraded.

The submarine cable data adds a layer of context. The predominance of human-caused cable outages means that resilience planning cannot focus solely on natural disaster scenarios. Anchor drags and dredging incidents can sever connectivity in ways that mimic hostile action, and Taiwan's response architecture must account for both accidental and deliberate disruptions.

The NCC's reference to UK infrastructure threats provides a comparative framework. Both Taiwan and the UK identify communications, electricity, transport, and financial networks as facing long-term, significant threats. The NCC report's framing of these challenges amid increased cyber activity and persistent geopolitical pressures aligns Taiwan's threat assessment with broader allied infrastructure vulnerability analyses.

For policymakers and security planners, the August 2026 exercises will yield actionable data on how mobile-dependent systems perform under throttled conditions. Emergency push alerts sent to Taipei users during the week of Aug. 10 serve as the first test of public alerting mechanisms ahead of the scheduled slowdown. The drill's outcomes may inform future moda policy on network resilience standards and the integration of civilian connectivity disruption scenarios into the annual civil defence exercise cycle.