Carrier Billing Is Switched On Even If You Never Applied — How to Check the Limit, Block It, and Contest a Charge

Carrier billing is a financial transaction called "communications billing service"

Paying with nothing but a phone number and a verification code, with the amount added to next month's telecoms bill, is what Korean law calls communications billing service. The governing statute is the Act on Promotion of Information and Communications Network Utilisation and Information Protection (the Network Act), and providers of the service must register under Article 53.

Three parties sit inside that structure: the payment gateway (PG) that displays the payment screen, the carrier that bills and collects, and the merchant that sold the goods or content. This is why disputes so often produce the familiar loop — the carrier refers you to the PG, and the PG refers you to the merchant. They are three separate companies.

Finding carrier billing on your bill

A telecoms bill divides broadly into charges for the telecoms service itself and amounts billed on behalf of others. Carrier billing sits in the second group, near the bottom, under a label that varies by company. If you see any of these names, that is carrier billing.

• Content usage fee / information usage fee — digital goods such as game items, webtoon or web-novel coins, and in-app purchases
• Mobile payment / mobile micropayment — physical goods bought from an online shop
• A separate billed line distinct from carrier add-on services — not something the carrier sells, but a third party's sale billed on its behalf

One misunderstanding recurs here: the carrier issuing the bill did not make the sale. Because the billing party and the selling party are different, the company you ask for a refund is not the company you ask to stop the charge. If the bill is paid by automatic transfer you can go months without noticing, so it is worth opening the itemised detail at least once a quarter.

Raising the limit requires consent — it is written into the statute

Network Act Article 58(1) provides that a communications billing service provider must obtain the user's consent in advance when providing the service or increasing the usage limit. Two practical points follow.

• Limits do not rise on their own. If yours has grown, a consent step happened somewhere. If you do not remember giving it, ask the carrier how it was obtained.
• The terms of that consent must be disclosed. Article 14 of the Notice on the Operation of Communications Billing Services sets out separately what has to be told to the user when consent is taken or a limit is raised.

The actual limit amount varies by carrier, subscription terms and payment history. There is therefore no figure that counts as "normal" — the only answer is to open your own line and look.

Where to check your limit and set it to zero

All three major carriers keep a carrier-billing management menu inside their customer app and website. The names differ slightly; the path does not.

1. Sign in to the carrier app and go to the billing and payment or usage history area.
2. Find the entry for mobile payment / micropayment / content usage fee.
3. Read the current usage limit and the recent payment history there.
4. On the limit-change screen, lower the amount or select full blocking of the service.

For a line you never use for payments, blocking is safer than lowering. Any limit you leave in place is an amount that can still be spent at any time. If the app is awkward, each carrier's call centre can do the same thing. If you do want to keep the service but add a safeguard, you can also apply for an extra verification step at the point of payment.

Lines registered to a child are a separate matter. Settings follow the account holder, so blocking a parent's line leaves the child's untouched. Check every line individually.

If a charge you do not recognise appears — a correction request comes first

Network Act Article 58 gives users the right to receive their usage records and demand correction. Where a user's correction request is well founded, the provider must notify the outcome within two weeks. This is a workable order.

1. Secure the record first. In the carrier app's carrier-billing history, capture the date and time, the amount, the merchant and the PG company.
2. File the correction request with both the carrier and the PG. Do not rely on a phone call: get a case number, or leave it in writing by text or email. A dispute later runs on records and nothing else.
3. Say so if the bill for that month has not yet been paid. Holding the charge at the billing stage is faster than paying and reclaiming.
4. If smishing was the cause, report it to the police and obtain the incident confirmation document. It becomes the evidence supporting a cancellation demand.

For the version that starts with a single text message, How to Spot Smishing and Phishing Texts sets out how to tell them apart. If the charges followed a lost handset, the order of operations is different — start with Lost your phone in Korea? The five things to do in the first thirty minutes.

Where to go when no agreement is reached

If the parties cannot settle it between them, formal channels remain.

• Self-regulatory dispute body — Article 59 of the Network Act provides for a self-regulatory organisation handling communications billing disputes. In practice the Mobile/ARS Payment Arbitration Centre performs this role and accepts cases involving the main providers.
• Adjudication request — Article 60 allows a party to request adjudication from the Broadcasting, Media and Communications Commission where agreement on damages cannot be reached, or cannot be sought at all.
• Telecommunications dispute mediation — if what you are contesting is the billing itself, the matter overlaps with the mediation route. The procedure and timescale are in When the Telecoms Provider Will Not Budge, You Can Escalate to Mediation — 60 Days, and No Filing Fee.

Whichever channel you use, it moves on records. Even without a call recording, noting the date of filing and what the agent told you makes a measurable difference.

What you can finish in five minutes today

1. Check the current carrier-billing limit in your carrier app.
2. If you never use it, block it; if you do, lower the limit to the amount you actually need.
3. Scan the last three months of payment history for anything you do not recognise.
4. Do the same for family lines, especially those of minor children and elderly parents.
5. To check at the same time whether your data is already circulating, see How to check whether your personal data has leaked.

Sources are Articles 53, 58, 59 and 60 of the Act on Promotion of Information and Communications Network Utilisation and Information Protection and Article 14 of the Notice on the Operation of Communications Billing Services; the limit-setting paths were verified against each carrier's customer guidance in August 2026. Limit amounts and menu names differ by carrier, plan and subscription terms, so check the actual setting on your own line, and whether an individual charge can be cancelled depends on the provider's determination and the facts of the case. This article sets out the procedure and does not substitute for legal advice on an individual dispute.