Line Valid Number FAQ: A complete guide from activation detection to crowd screening

When going overseas to Southeast Asia, especially markets such as Vietnam, Thailand, and Indonesia, Line is second only to WhatsApp as an instant messaging tool. Many teams have a batch of mobile phone numbers in hand, but they don’t know which numbers have been registered with Line, and they don’t know how to batch screen out high-value Line valid numbers (numbers that have registered Line accounts). This FAQ will help you clarify all core issues at once, from definitions, detection processes, field meanings to actual customer acquisition scenarios.

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What is a valid Line number? What is the difference from an ordinary mobile phone number?

Simply put, Line valid numbers refer to those mobile phone numbers that have registered Line accounts.普通手机号（例如中国大陆的 +86 号码）可能从未注册过 Line，或者注册后又注销。 Only numbers that have been confirmed to be “activated” through testing can be used for Line private messages, community invitations, or advertising.

Three common definitions of Line’s valid numbers (activated/active/gender)

For marketing scenarios, Line filters are usually divided into three levels, corresponding to different data values:

Detection type	Definition	Applicable scenarios
Activation detection	Verify whether the number has been registered as a Line account (basic activation status)	Basic user screening, group basic notifications
活跃检测	确认号码在最近一段时间（如7天/30天）内登录过 Line	高触达率要求的私信营销、社群拉新
Gender Detection	On the basis of activation, additional fields such as gender (male/female/unknown), age (approximate age group), etc.	Targeted advertising and vertical category promotion (such as male users promoting digital products)

Note: The age field comes from the additional information of the gender detection result, which can be interpreted as “people around 30 years old”, not the precise age at the ID card level.

Why do we need to pay attention to the valid Line number rather than the mobile phone number itself when acquiring customers overseas?

In countries such as Vietnam and Thailand, Line is a national-level social application with a huge user base. But not all mobile phone numbers are registered with Line. Directly initiating Line messages to a batch of unverified numbers is not only ineffective, but may also trigger the platform’s anti-spam mechanism. Only by pre-screening Line valid numbers can we ensure that every contact is meaningful. Especially for cross-border e-commerce and independent website promotion teams, precise delivery is needed under cost pressure.

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How to detect whether a mobile phone number is a valid Line number?

Detecting Line valid numbers relies on a professional number screening platform (such as KK-DATA). The principle is to verify the registration status of the number through the back-end interface instead of sending notifications or harassing users. Here is the general process:

Typical process of Line valid number detection

1. 准备号码列表：将待检测的手机号整理为 CSV/TXT 文件，每行一个号码，包含完整国际区号（如 +84 开头表示越南）。
2. Submit detection task: Log in to the console (for example https://app.kkdata.cc/), upload the number list and select “Line Start Detection” (or “Active Detection”, “Gender Detection”).
3. System processing: Automatically perform verification, usually completed within minutes (depending on quantity).
4. View/Export Results: After the task is completed, download the CSV file, which contains the registration status, gender, active time and other fields of each number.

Does detecting a valid Line number require the consent of the other party?

unnecessary. Line valid number detection is a back-end status query and does not send any notification or request to the target mobile phone.对方完全无法感知被检测，这是行业普遍采用的合规方式。 Of course, subsequent actual marketing actions (such as private messages) must still abide by the Line platform rules to avoid harassment.

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What fields does the Line valid number detection result contain?

Taking KK-DATA’s Line filter function as an example, the export results usually include the following fields (subject to the actual export by the console):

Among them, Line UID can be used to directly initiate friend or group invitations without relying on mobile phone numbers again. Gender and age fields can assist in crowd profiling and improve marketing accuracy.

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What is the difference between Line valid number and Line active number?

This is the most confusing concept for newbies. Valid number (activated) only means that the number has previously registered a Line account, but the user may have abandoned or even uninstalled the app. The active number means that the number has logged into Line within the specified time window (such as 7 days, 30 days) and is a real “live” account.

Detection type	Meaning	Cost (usually)	Recommended scenarios
Activation test	Number registered Line	Lower	Brand notification, verification code, basic whitelist
Activity detection	Recent login behavior	High	Private message marketing, community recruitment, high conversion demand

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How to obtain the mobile phone number to be detected for Line valid number screening?

Many teams will ask: “I don’t have a ready-made number, how do I get started?” Common ways to obtain numbers to be tested include:

• Own customer data: There is already a mobile phone number in the CRM or order system, which can be directly imported for screening.
• Purchase/Collect: Purchase the target country number segment from the data provider (pay attention to compliance and quality).
• Number generation: Use the global number generation function of the tool to randomly generate numbers by country and number segment.

Taking KK-DATA as an example, the [Global Number Generation] module provided by the platform supports 240+ countries/regions and can randomly generate numbers in Vietnam +84, Thailand +66 and other number segments, and the generation is completely free. After generation, it can be directly submitted to the Line filter task to form a “Generate→Filter→Export” pipeline.

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How to control costs when detecting valid Line numbers in batches?

KK-DATA adopts a pay-per-item model: recharge USDT first, and deduct it from the balance after the task is completed. Prices vary by platform and detection type, see console real-time prices for details. The core strategies for controlling costs are as follows:

Why can data deduplication save Line screening costs?

The same number is detected repeatedly, which means two charges are wasted. KK-DATA’s “Data Deduplication Warehouse” will automatically record the detected numbers, and no repeated deductions will be made after cross-task comparison. When the team screens numbers in batches, it is recommended to always use the same account and enable the deduplication function.

Should I choose enabled detection or active detection to save budget?

If the budget is limited and the goal is only to initially select user groups (for example, planning a mass mailing event), you can cover the basic population by doing an activation test first. If high conversion is needed in the future, the inactive ones will be eliminated for the already activated numbers. This strategy of “coarse screening first and then fine screening” can significantly reduce costs.

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I am a newbie and it is my first time to screen valid numbers in Line. What are the common mistakes?

Here are 5 common mistakes newbies make and how to avoid them:

1. Error: The mobile phone number does not include an international dialing code Correct: Make sure the number prefix includes the area code +84 (Vietnam), +66 (Thailand), +62 (Indonesia), etc. before submitting.

2. Error: Use non-target country code segment Correct: Line has high popularity in Vietnam, Thailand, and Indonesia, but low registration rates in China, Japan, and other regions, so it should be selected accordingly.

3. Error: Value of gender/age field ignored Correct: Gender testing is slightly more expensive but can help with targeted messaging. For example, we promote 3C products to male users and beauty products to female users.

4. Error: Submitting too large a list (more than 1 million items) at one time Correct: The upper limit for a single task is about 1 million, and if it exceeds the limit, it can be submitted in batches.

5. Error: Data deduplication function not used Correct: Enable automatic deduplication to avoid repeated charges for the same number.

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How to apply Line valid numbers to actual customer acquisition scenarios?

After filtering out Line valid numbers, the data can be directly used in the following scenarios:

Scenario 1: Targeted marketing for Vietnamese e-commerce users (male/age field)

Let’s say you’re promoting game console accessories in Vietnam. Through the Line gender detection results, filter out numbers with gender = male and age field about 25-35 years old. This group of users is more likely to be interested in gaming devices. Then send personalized messages to these UIDs through Line’s official API or third-party mass messaging tools.

Scenario 2: Line community batch recruitment

Using the Line UID field, you can batch invite registered users to your official group. Note: Some platforms have frequency restrictions on batch invitations. It is recommended to cooperate with deduplication and interval control. Compared with randomly adding followers, UID based on activity detection can significantly improve the conversion rate of group entry.

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FAQ

Question: How many lines can Line valid number detection screen at one time?

Answer: Taking KK-DATA as an example, a single task supports up to about 1 million numbers. If you need to detect a larger quantity, you can submit it in multiple times and enable the deduplication function to avoid repeated billing. Please refer to the console task submission interface for the specific upper limit.

Question: After detecting Line’s valid number, can Line’s UID, gender and age be exported?

Answer: Yes. KK-DATA’s Line filter results support exporting uid, gender fields (male/female/unknown), and approximate age ranges (such as data about 30 years old). Age data comes from an additional field in the gender detection result and is not a stand-alone precise age product.

Question: Is there any charge for Line valid number detection? What’s the price?

Answer: Billing is by item, recharge first and then deduct. Different detection types (activated/active/gender) have different unit prices. The specific cost is based on the “estimated cost” displayed on the console before submitting the task. The recharge method supports USDT (TRC20), with a minimum of about 50 USDT.

Question: Will the other party know if the valid number of Line is detected?

Answer: No. This detection is a back-end open state verification, and no notification or request will be sent to the other party’s mobile phone, and the other party will not be able to sense that it is being detected. Please feel free to use it.

Question: If I have a large number of numbers that need to be tested, how can I avoid deductions for repeated testing?

Answer: It is recommended to use the “data deduplication warehouse” function of KK-DATA. This function can automatically compare detected numbers across tasks, and only deduct fees once for the same number. Make sure to check “Enable deduplication” before each submission to avoid repeated deductions.

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Line effective number screening is the first step to acquire customers overseas in Southeast Asia/Vietnam. If you want to quickly test your own number list, or generate target country number segments and screen out high-value users, it is recommended to get started directly.

👉Log in to the console to start screening numbers 👉 If you encounter any problems, you can contact customer service through two-way https://t.me/kkdata_robot for immediate help

For more function introduction, please visit the official website https://kkdata.cc/ and documentation https://docs.kkdata.cc/.