How to Check If a Phone Was Secretly Opened in My Name — Identity Theft Verification, Reporting, and Plan Comparison
by selpl Editorial Team
How to Check If a Phone Was Secretly Opened in My Name — Identity Theft Verification, Reporting, and Plan Comparison
In Korea, the foreign registration number is used as a personal identification method for mobile phone activation, just like the resident registration number. If a foreign registration number is leaked, there's a risk that someone could secretly open a line in your name without your knowledge. This article outlines how to check if there's a number opened in your name without your knowledge, and the procedures for reporting if you discover such damage.
3 Common Obstacles During Registration and Verification
When checking for identity theft or trying to reactivate a number after experiencing damage, foreign residents often encounter three major issues:
- Identity verification documents: Required documents vary by telecom company and retailer, including foreign registration card, passport, domestic residence address, etc.
- Remaining stay duration and contract terms: If the remaining stay period is short, subscribing to plans with longer contract periods may be restricted. This criterion also varies by telecom company and product.
- Device network compatibility: Devices brought from abroad or used phones may not support specific telecom networks among KT, SK, or LG.
None of these three can be definitively guaranteed to work in all cases, and since conditions differ by telecom company and plan, it's safest to always confirm directly with your telecom provider.
How to Check If There's a Line Opened in Your Name
- Using identity theft prevention service: Through services like the PASS app, you can check the status of mobile phone lines opened in your name. However, whether foreign registration number lookup is supported and the usage procedure may vary by service and telecom company, so direct confirmation before use is necessary.
- Checking subscription status by telecom company: You can check if there are lines opened in your name through customer service centers or websites of each telecom company such as KT, SK Telecom, and LG U+. MVNO (discount mobile) operators may also have different inquiry channels depending on the network they belong to (KT, SK, or LG), so if you don't know which network the line was opened on, you'll need to check multiple channels.
- Direct inquiry to customer service: If online inquiry is difficult or foreign language support is needed, you can call the telecom company's customer service center, verify your identity, and request subscription details. The available languages and processing methods differ by telecom company.
If You Discover Identity Theft Damage
If you discover a line opened without your knowledge, the typical response process is as follows:
- Immediately contact the relevant telecom company to request line suspension. You may need to provide proof that you did not open the line and submit identity verification documents.
- Report the damage to police (cyber investigation reporting channel). Identity theft can be handled as a criminal case, so keeping a report record is helpful for subsequent processing with the telecom company.
- File a damage claim with the telecom company and discuss charge processing. The way charged fees and cancellation fees are handled varies by telecom company's internal regulations, so it's good to consult while submitting the incident receipt or police confirmation.
Processing deadlines, refund conditions, and required documents vary by telecom company, so this article does not specify concrete timeframes or amounts. You must receive guidance tailored to your case from the relevant telecom company's customer service center.
After Reporting — Comparing Plans to Reactivate with Peace of Mind
After resolving the identity theft issue, if you want to open a new number in your own name, it's good to compare plans at similar price points across different telecom companies.
| Telecom Company | Plan | Monthly Fee | Data | Calling | Text | Network |
|---|---|---|---|---|---|---|
| KTM Mobile (MVNO) | M Budget 1.5GB 100 min | ₩5,500 | 1.5GB | 100 min | 100 | KT network |
| SK Telecom (MNO) | Easy S | ₩15,950 | 1GB + low-speed data after depletion (speed for text/messenger only) | 200 min | 200 | SK network |
| LG Hello Mobile (MVNO) | DATA Worry-Free SIM 7GB | ₩18,500 | 7GB + low-quality video streaming speed after depletion | Unlimited (300 min add-on) | Unlimited | LG network |
| The One Mobile (MVNO) | TOP 7GB Basic (Millie's Library) | ₩22,000 | 7GB + low-quality video streaming speed after depletion | Unlimited (300 min video/add-on) | Unlimited | KT network |
Source: selpl plan database, based on 2026-10-11. Subject to change based on telecom company policies.
Speed after data depletion varies by product. The plans in the above table allow for message checking (low speed) or low-quality video streaming (1Mbps level) after depletion. If you watch videos frequently, choosing a plan with faster post-depletion speeds is advantageous.
Frequently Asked Questions
Q. Is it possible to open a mobile phone with a foreign registration number? Yes, it is. However, required documents and stay duration conditions vary by telecom company and plan, so confirmation with the relevant telecom company is necessary before subscription.
Q. Can foreigners use the identity theft prevention service? Whether foreign registration number lookup is supported may vary depending on the service provider and usage procedure. It's safe to confirm directly on the service information page or with customer service before using.
Q. Do I have to pay the charges for a line opened due to identity theft? Once the damage is confirmed, many telecom companies handle it through negotiation, but the specific processing method and timeline vary by company. Keeping the incident receipt and consulting is helpful.
Q. Can I report or reactivate if my stay period is almost up? Reporting itself is possible regardless of stay duration, but the required stay period conditions for opening a new line vary by telecom company and plan, so confirmation before subscription is necessary.
Q. Is identity theft lookup possible for discount phones (MVNO)? Yes, it is. However, the inquiry channel may differ depending on which network (KT, SK, or LG) the MVNO operator uses. If you don't know which network was used for activation, you'll need to check multiple channels.
Frequently Asked Questions
Q. How do I check if there's a mobile phone secretly opened in my name? You can use the identity theft prevention service in the PASS app or check your subscription status through customer service centers or websites of each telecom company (KT, SK Telecom, LG U+). However, whether foreign registration number lookup is supported and the procedure varies by service and telecom company, so confirmation before use is necessary.
Q. Can identity theft lookup be done for discount phones (MVNO)? Yes, it can. However, since discount phone operators belong to different networks (KT, SK, or LG), the inquiry channel differs. If you don't know which network was used for activation, you'll need to check multiple channels.
Q. What should I do first if I discover identity theft damage? The typical process is to immediately contact the relevant telecom company to request line suspension, report the damage to police, and then negotiate charge and cancellation fee handling with the telecom company using the incident receipt. Specific processing timeframes and conditions vary by company.
Q. Are there restrictions on reopening a line after reporting due to stay duration? Reporting itself can be done regardless of stay duration, but when opening a new line, available contract terms may vary by telecom company and plan depending on remaining stay period, so confirmation before subscription is necessary.