The 'Digital Anonymity' Control Experiment Spreading from Voice → Data → Platform
The Japanese government has begun working on legal revisions to expand identity verification requirements to data-only SIM cards. The fact that the axis of existing telecommunications regulation centered on phone numbers is shifting to 'data access rights' means this measure is interpreted as a transition in digital crime response strategy beyond simple institutional improvements. In an environment where SNS and messenger-based fraud has become normalized, Japan has begun redesigning telecommunications infrastructure itself as the primary gateway for blocking crime.
"Data, Not Calls, Has Become the Entry Point for Crime"
The Japanese government is preparing an amendment to the "Act on Prevention of Unauthorized Use of Mobile Phones" targeting submission to the 2026 Diet. The core of the amendment is expanding the identity verification (KYC) obligation at contract time — currently applied only to voice call SIMs — to data-only SIMs.
The current system has been designed on the premise of voice calls via phone numbers. However, the criminal environment has already moved beyond that premise. Most investment fraud, romance scams, and fake cryptocurrency trading scams that have surged in Japan recently are conducted not through phone calls but through SNS, encrypted messengers, and app-based data communications. The government's position on the problem is clear. The fact that the starting point of crime has moved no longer from "phone numbers" but to "anonymous data lines."
Why Data SIMs: Structural Problems of 'Anonymous Data Access Rights'
The fraud crime patterns analyzed by Japan's National Police Agency and Consumer Affairs Agency are relatively consistent.
First, criminal organizations acquire large quantities of low-priced data SIMs.
Second, those lines are used to mass-generate SNS and messenger accounts.
Third, overseas servers and overseas payment methods are combined to make tracking difficult.
Fourth, after a certain period, accounts are discarded and the same method is repeated.
Phone numbers are rarely used in this process. Because with just a data SIM, SNS registration, encrypted messenger use, and phishing site access are all possible. That is, a structure has formed where crime's entry point can no longer be controlled with telecommunications line regulation alone. The Japanese government's background in seeking to include data SIMs as regulatory targets is rooted in this recognition of reality.
Core of the Legal Amendment: Blocking 'Structure' Not 'Users'
This amendment does not stop at simply widening the scope of identity verification. The focus of institutional design is aimed not at post-hoc tracking of criminals but at blocking the very structure that makes crime possible.
First, identity verification through ID documents will be required when contracting data SIMs. This is close to a declaration that data communications must carry the same level of accountability as voice communications.
Second, telecommunications companies are given the authority to refuse contracts with those holding excessive numbers of lines. This is a device to institutionally block the practice of criminal organizations securing tens or hundreds of data lines.
Through this, Japan's telecommunications regulation moves from a "post-incident investigation"-centered model to a "pre-blocking at the telecommunications infrastructure stage" model.
Is This Only Japan's Choice: Connection Points with Global Regulatory Flows
This measure can be seen as one branch of the global trend toward stronger digital identity regulation rather than a response unique to Japan.
Many European countries already enforce prepaid SIM registration requirements, and Singapore and Australia are gradually linking telecommunications accounts to national digital identity systems. The United States places weight on platform-centered KYC and real-name enhancement rather than telecommunications, but that too is no different in the broad direction of reducing anonymity.
The characteristic point of Japan's choice is the 'layer' of regulation. In a situation where platform regulation is technically and legally complex, the telecommunications line — the most physical and controllable layer — was prioritized as the control point.
Issues and Controversies: Crime Deterrence vs. User Inconvenience
Of course, backlash and concerns are also considerable.
Data SIM use by foreign tourists or short-term visitors may become inconvenient, and for users who use many tablets, IoT devices, and sub-devices, there is also the possibility of additional administrative burden. For telecommunications companies, increased contract management and identity verification costs are inevitable.
In response, the Japanese government is clearly taking the position that "detailed operational standards can be adjusted in the future, but the very structure where anonymous data communications are abused as criminal infrastructure cannot be left unaddressed." It is a policy choice to prioritize public safety over inconvenience.
The Bigger Picture: Changes in State Perception of 'Anonymity'
The significance of this amendment discussion goes beyond technical regulation. Because it represents a change in the state's perspective on how to define anonymity in digital society.
If the question of past telecommunications regulation was "who made the call," it is now changing to "who accessed the data." In the era of SNS, messengers, and encrypted apps, data access rights are the starting point of all digital actions. Japan has sent a clear signal that it will no longer leave this point as an unregulated domain.
The Next Stage of Telecommunications Regulation Has Opened
Japan's push to mandate identity verification for data SIMs is not a simple legal revision. It is an attempt to shift the axis of crime response from post-hoc tracking to pre-emptive blocking, move the focus of telecommunications regulation from phone numbers to data access, and present new standards for state intervention on digital anonymity.
If this experiment settles institutionally, other countries will also have difficulty avoiding the question "how anonymous should data communications be?" Japan's choice to block SNS fraud is likely to be recorded as one turning point in redrawing the boundary between freedom and responsibility in digital society.
