What this review actually covers
This is a reader checklist, not a report of a test run by TruthsSeek. It organises the three ways someone might reach your LINE profile — your phone number, your LINE ID, and an old personal QR code or link — and shows what to check on the phone where your account is signed in.
A search for a public username on another service is a different task. TraceSeek, the app covered by this publication, looks up public usernames across 3,000+ platforms. It cannot change LINE settings, recover private accounts or verify anyone’s identity, so it plays no part in the steps below.
Route 1: discovery by phone number
On the main phone where your LINE account is active, open Friends, then Allow others to add me, and review the phone-number setting there. This controls whether people who already have your number can add you as a friend through it.
LINE provides separate settings for adding an account by phone number and by LINE ID; changing them does not remove existing friends. Source
That last point matters for how you read your own results. If you switch the phone-number option off and a colleague can still message you, that does not mean the setting failed — it may mean the friendship already existed.
Route 2: discovery by LINE ID
On the same phone, open Profile, then Allow others to add me by ID, and review whether ID search is on. This is a separate control from the phone-number route, so one can be off while the other stays on.
If you cannot find either label, do not assume the setting is missing. The reviewed facts do not establish every menu path for every region, app version or device, so treat any difference in wording as something to confirm in your own app rather than a fixed rule.
Route 3: an old personal QR code or link
If you have shared a personal QR code or its link before — on a slide, in a group chat, in a printed handout — the copy in circulation may still work. Regenerating the personal QR code is the reviewed way to retire the previous one.
Regenerating the personal LINE QR code invalidates the previous QR code and associated link; navigation differs by region and device. Source
Two limits are worth stating plainly. First, a reset changes the code and link; the reviewed claims do not say it deletes contact details someone already saved, so do not treat it as a clean-up of their address book. Second, the exact path to the QR screen depends on your region and device, so follow the labels you actually see.
Three-route worksheet
Fill this in on the phone that holds your account. The “Where to look” column reflects the main-phone paths named in the brief; the QR row is intentionally open because navigation varies.
| Route | Where to look | What you record | What a change does not do |
|---|---|---|---|
| Phone number | Friends > Allow others to add me | On or off, plus the date you checked | Does not remove existing friends |
| LINE ID | Profile > Allow others to add me by ID | On or off, plus the date you checked | Does not remove existing friends |
| Personal QR / link | QR screen; path varies by region and device | Whether an old copy was shared, and whether you regenerated it | Does not, per the reviewed claims, delete details others saved |
Region and device differences
Japan, Taiwan and Thailand are often described as having their own navigation patterns, distinct from other regions. The reviewed claims confirm that QR-related navigation differs by region and device, but they do not supply a menu-by-menu map for each market. Use the worksheet to note what your phone shows, and avoid copying another person’s path as if it were universal.
Failure paths to expect
- The toggle is off but the person can still reach you. Check whether you were already friends before the change.
- You regenerated the QR code but an old poster still scans. The reviewed claim is that the previous code and its link are invalidated; if something still works, re-check which code you actually replaced.
- A menu label is not where a guide says it is. Record the label you see, and treat the difference as a version or region variation rather than a broken account.
- You want to remove existing friends as well. These discovery controls are not a friend-removal tool; handle that as a separate task.
A useful next step
Once you have recorded the three routes, keep the worksheet with your other account notes and revisit it after you change a phone number or share a new QR code. If you are also reviewing who can find you on another messaging app, review the related account task for a comparable privacy review.