Taiwan Throttles Mobile Internet to 256 Kbps in Seven Cities During Invasion Drill

Why Taiwan Cut Mobile Data to 256 Kbps in Seven Cities

On Thursday 13 August, mobile internet in Taipei and six other Taiwanese cities and localities was deliberately slowed to 256 Kbps for 30 minutes. The reduction was part of the final phase of the annual Han Kuang military exercises, which simulate Taiwan's response to a possible Chinese invasion. Telecom operators restricted mobile web traffic to a level that made text messages usable but data-heavy services difficult, in areas where 5G is normally available.

Officials asked for public understanding and support, calling the slowdown a necessary drill. This year's Han Kuang exercises have been more disruptive than previous editions: they have included reservists and more civilians, and have emphasised realistic scenarios. In the capital, passengers at a metro station waited about 30 minutes to exit after doors were closed as part of an air-raid simulation. A Hong Kong tourist, Allen Hsieh, said the exercise was convincing and caused him no inconvenience.

The drills also tested the relocation of critical hospital operations to underground facilities. Taiwan has been intensifying both its exercises and its weapons purchases as tensions with Beijing have risen. China claims the island as its own territory and regularly sends military aircraft, coast guard vessels and other ships toward it.

According to Taiwan's Ministry of National Defense, between Wednesday 12 and Thursday 13 August morning, 18 Chinese military aircraft and 11 naval vessels operated around Taiwan. The internet slowdown therefore sits inside a broader military pressure campaign, not an isolated event.

The Han Kuang Drill's Shift From Quiet Rehearsal to Civilian Stress Test

Taiwan's latest Han Kuang phase is significant less for the military equipment used than for the way it treated civilians as part of the defense system. The exercises moved beyond largely invisible metro air-raid drills into deliberate disruption of daily digital life.

The Shift From Low-Impact Rehearsals to Whole-of-Society Preparation

Earlier urban resistance drills in Taipei often avoided causing friction: air-raid exercises at metro stations did not stop passenger flow. This year, local governments coordinated to close station exits and throttle mobile data. That change suggests Taiwan's defense planners are testing whether the public can tolerate real friction during an emergency, not just symbolic participation. The fact that operators applied the 256 Kbps limit in seven places and officials publicly requested support indicates the disruption was planned as a measurable stress test rather than an accident.

Why the 256 Kbps Slowdown Matters More Than an Outage

A deliberate slowdown is different from a total blackout. At 256 Kbps, text-based communication can still work, but video, large file transfers and many apps become effectively unusable. By degrading service instead of cutting it, Taiwanese authorities can test continuity of essential messaging while observing which civilian services collapse first. The exercise therefore offers a useful data point for civil-defense planning: it reveals society's dependence on high-bandwidth mobile networks and shows which functions can survive on a narrow channel.

The China Backdrop: Deterrence and Domestic Readiness

The drill took place while Taiwan's defense ministry reported 18 Chinese military aircraft and 11 naval vessels around the island in a day-and-a-half window. Beijing's daily military activity near Taiwan provides the strategic rationale for more realistic exercises. From Taiwan's perspective, making drills visible to the public also has a signaling function: it demonstrates to China that civilian society is being prepared, not just the armed forces. The hospital relocation exercise points in the same direction, preparing for the possibility that critical services would need to keep operating from underground sites.

What Residents and Businesses in Taiwan Should Expect From Future Drills

For residents, businesses and critical-service operators in Taiwan, the drill sets a practical template for future Han Kuang phases.

• Mobile data in affected areas can be reduced to 256 Kbps during exercises; text messaging remained the only reliably usable channel, so individuals and businesses should not assume standard mobile apps will work during planned disruption.
• Metro passengers may be held at station exits for up to 30 minutes during air-raid simulations, as happened in Taipei; travelers should build extra time into journeys on exercise days.
• Hospitals and other critical providers should expect further tests of underground relocation, since Taiwan integrated civilian infrastructure into this year's maneuvers and is making such realism a core part of the drills.