Question from a reader:
Recently, I received a call from an unknown number starting with 3880, and I ended up calling back. I heard a strange noise that sounded like a crossed line. Was it a mistake to call back? I’m worried that I might be charged a large fee. What should I do?

The Mystery of Unknown Incoming Numbers and a
Legal Perspective

Recently, a friend consulted me, saying, “I called back a number starting with 3880 and heard a strange noise, which made me anxious.” Many people actually share this anxiety about unknown phone numbers. This time, I would like to consider this issue from a legal perspective.

Is it Dangerous to Call Back Unknown Numbers?

First of all, calling back an unknown number is generally not recommended. In particular, numbers starting with 3880 are often associated with specific communication services. Unlike regular mobile phone numbers like 090 or 080, these numbers can sometimes incur high call charges. I once had a similar experience. One day, I noticed an unknown number in my call history and, out of curiosity, decided to call back. I was met with incomprehensible noise and quickly hung up. Looking back, I somewhat regret acting out of curiosity.

What if a Large Fee is Charged?

Now, returning to the main topic, if you have called back, there is indeed a possibility of incurring a large fee. However, the amount will vary depending on the caller and the services provided. Under Japanese law, charges not explicitly stated in advance are not permitted. This means that unless the number you called clearly informs you that “this number incurs high call charges,” you can dispute any charges that arise. However, in reality, such numbers are often used by malicious operators, leading to trouble. One case I know of involved a student who called an unknown number and received a hefty bill, but ultimately managed to legally invalidate the charge. The student consulted the consumer center and resolved the issue through negotiation with the operator. It’s important to handle such situations calmly.

How to Respond and Future Precautions

If you have called back an unknown number, it is crucial to remain calm and respond appropriately. Here are some specific steps to consider.

1. Immediately Research the Phone Number

I recommend looking up the number you called back to see what it is. There are several websites that provide information about phone numbers. If it is a malicious operator, it is likely that other users have had similar experiences.

2. Discuss Your Concerns with Friends or Family

You don’t have to bear your worries alone. Talking to friends or family may provide you with objective opinions. They might have had similar experiences and could offer valuable advice.

3. Consult the Consumer Center

If you receive a large bill, it is wise to consult the consumer center. They can provide appropriate advice based on the law and may negotiate on your behalf if necessary.

Conclusion and Preventive Measures

Calling back an unknown number is generally a behavior to avoid, but if you happen to do so, it is important to handle it calmly. By understanding your rights and consulting the appropriate agencies when needed, you can alleviate your anxiety. As a preventive measure, I recommend being cautious about unknown numbers and prioritizing communication through social media or messaging apps. Additionally, if you receive a call, make it a habit to look up the number before calling back. Through this experience, I have become more cautious myself. I hope you all take proper measures to avoid similar troubles. Psychologically, people tend to make intuitive judgments when feeling anxious, so maintaining calm judgment is crucial. Such a mindset can help prevent future troubles.