Must do before the event: How to clean the list of valid Line numbers and improve customer acquisition conversion rate

In the process of B2B overseas customer acquisition, many teams spend a lot of energy collecting line numbers, writing marketing words, and designing event processes, but ignore a key step: Clean valid line numbers before the event. If you get an original list of numbers and start mass messaging directly, the result may be that the number vacancy rate is 30%, the reach rate is less than 50%, and users complain about account suspension. The root of the problem is that more than half of the “target users” you send are not Line users at all.

The real conversion rate improvement is not by sending more numbers, but by sending the right number. This article will give you a complete understanding of what a valid Line number is, why it must be cleaned before an event, and how to do it all in one go through automated tools.

Why must the valid Line number be cleared before the event?

Three major consequences of not cleaning

• Waste of budget, ineffective results: Suppose you have 100,000 numbers, 35% of which are not registered Lines. Based on the cost of sending a single activity of 0.1 yuan, you have wasted 3,500 yuan. What’s worse is that these invalid numbers will also lower the reach rate and open rate, making the conversion rate data of the entire activity very ugly.
• Corrosion of sending channel reputation: Most Line marketing tools have an account reputation mechanism. Continuously sending messages to a high proportion of invalid numbers will result in your sending account being demoted, limiting the frequency of sending, or even being banned. Once there is a problem with the channel, all subsequent activities will be affected.
• Conversion rate does not increase but decreases: Many times teams complain that “Line customer acquisition effect is poor”. In fact, it is not that the Line channel is not good, but that more than half of the numbers in your list are not target users. 50 messages sent to Line’s effective and precise users are far more effective than 500 messages sent blindly to uncertain people.

What direct benefits can cleaning bring?

• The reach rate is significantly improved: After cleaning, every message you send will be actually received by Line users, and the reach rate can be increased from 50% to 85%+
• Reduced sending costs: With the same budget, you can send to more truly effective users, and the actual ROI doubles or even more
• Improve operational efficiency: The cleaned list can be directly imported into subsequent CRM or message push tools, eliminating the need to manually determine which numbers are valid
• Reducing subsequent duplication of work: The cleaned list has been deduplicated and classified, making it more convenient for subsequent secondary contacts or group operations.

What is a valid Line number? How to tell if a number is “valid”?

Many people regard “having a Line account” as valid, which is actually not accurate. A true Line valid number means that the number has registered a Line account, and the account status is normal and can receive messages. In actual detection, it is usually necessary to combine multiple dimensions for judgment.

The difference between Line valid and Line activated

Detection dimensions	Definition	Typical uses
Line activation	This number has been registered with Line account (basic verification)	Preliminary screening to eliminate unregistered numbers
Line Valid	The account status is normal and messages can be received (more accurate)	The final list before the event to reduce invalid sending
Line active	Recent online/usage records (extra dimension)	For marketing activities that require high response rates
Line Gender	Detect public gender information associated with the account	Targeted push of gender-related content (such as male groups)

From the actual scenario, it is recommended to complete at least the “Line Valid” test. If the activity requires a high response rate (such as limited-time offers, invitations to join a group), you can also superimpose “activity” detection to avoid sending messages to users who have not logged in for several months or even longer.

Interpretation of commonly used detection fields

When using a screening platform such as KK-DATA, the test results usually include the following fields:

• Number itself: the original mobile phone number you entered
• Open/valid status: 0 or 1, indicating whether it is registered/available
• Gender: Male/Female/Unknown (can be used to filter specific groups such as “males”)
• uid: Line user ID (can be used for precise orientation or interface docking in some scenarios)
• Activity window: Some platforms support specifying recent activity detection (such as active within 7 days / 30 days)

The complete process of cleaning Line’s valid number list before the event

The entire process, from raw numbers to final export of available lists, can be broken down into 4 steps. With tools like KK-DATA, the entire process can be completed in less than 10 minutes.

Step 1: Prepare the original number (generate or import)

If you don’t have a ready-made number on hand, you can use the Global Number Generation module to randomly generate it by country/number segment. KK-DATA supports number generation in 240+ countries and regions, covering Line’s mainstream markets such as Japan, Taiwan, Thailand, and Indonesia. If you have your own number library, just upload the CSV/TXT file and import it.

Step 2: Deduplication and pre-screening

Before submitting for testing, it is strongly recommended to use the data deduplication warehouse function. If the same batch of numbers has been detected in other tasks, the deduplication warehouse will automatically exclude it to avoid wasting balances through repeated detection. This step can save you 20%–40% on screen size costs.

Step 3: Detect Line valid numbers in batches

Select the detection type in the KK-DATA console:

• Line activation detection (Basic version)
• Line valid detection (recommended, used before events)
• Line Gender Detection (if targeting is required)

Upload the number list and submit the task. The system will automatically detect each item and send a notification when the task is completed. A single task supports up to about 1 million numbers, which is suitable for medium and large-scale event cleaning.

Step 4: Export the out-of-box available list

Once the task is completed, choose the export format (CSV / TXT), including fields: number, valid status, gender, uid, etc. This list can be imported directly into your CRM, push messaging, or other advertising tools.

Comparison between the cleaned Line valid number list and the original list

In order to more intuitively demonstrate the effect of cleaning, let us use a set of simulated data (not real cases) to illustrate the difference:

Indicators	Original list (not cleaned)	Cleaned list (Line effective + active)
Total number of numbers	5000	2150 (effective rate 43%)
Empty/invalid number	2850	0
Actual reach rate	42%	93%
Average response rate	2.1%	6.8%
Unit conversion cost	Higher	About 60% lower
Message sending consumption	High	Significantly lower

The conclusion is clear: 50 effective lists are better than 500 invalid blind calls. Instead of sending 5,000 messages to 500 real users, it is better to only send 2,000 messages to the majority of valid users found.

What details need to be paid attention to when cleaning valid Line numbers?

Avoid repeated testing and waste

If the same batch of numbers has been tested in the previous activity, it is not recommended to submit for testing again. By turning on the “Deduplication Warehouse” in KK-DATA, you can automatically filter the detected numbers to avoid repeated deductions.

Combined with activity filtering to improve response

If the event time is tight and the response rate is high (such as flash sale, invitation to join a group), it is recommended to check the “activity level” at the same time. It will only help you send messages to users who have been active on Line recently, and the response rate can be increased by 3–5 times compared to a static list.

Correct export field matching follow-up activity tool

Different mass sending tools require different field formats (such as pure number, including uid, including gender, etc.). Confirm the required fields in the tool description before exporting to avoid the need to manually convert the format after exporting in KK-DATA.

How to use tools to efficiently complete line valid number cleaning? (Take KK-DATA as an example)

KK-DATA is a screening platform focused on acquiring customers overseas, supporting multiple social platforms such as Line, Telegram, WhatsApp, Zalo, and Viber. In terms of Line cleaning, the following capabilities are provided:

• Line activation/validity detection: Verify whether the number has registered a Line account and is in normal status
• Line Gender Detection: Identifies the public gender associated with an account (can be used for male/female targeting)
• uid export: Export Line user ID to facilitate connection with advanced application scenarios
• Global number generation: Supports Line’s major markets such as Taiwan, Japan, Thailand, Indonesia, Vietnam, etc.

Operation process:

1. Log in Console
2. Upload or generate number
3. Select Line detection type (valid / gender / active)
4. Submit the task → wait for completion → export the results

The entire process is completed online, no software installation is required, billing is per item, pay as you use, and no subscription package is required.

Note: Please log in to the console to view the real-time price for the specific unit price. No fictitious price figures are allowed.

Summary: Use Line to clean effective numbers so that every activity hits the target.

The core of a successful Line customer acquisition campaign is not too many numbers, but the right number. Allocating 10% of the time and budget to clean Line valid numbers before the event can eliminate more than 40% of invalid sending costs, double the actual reach rate, and significantly increase the final ROI.

Don’t wait until the results of the event come out to regret it – the next list starts with cleaning. Whether you choose KK-DATA or build your own process, remember the core principle: filter numbers before sending.

👉 Go to Application Console to start your first cleaning; if you have any questions, you can get help at any time through Two-way Contact Customer Service; Document address: https://docs.kkdata.cc/.

FAQ

**Q: What is the difference between a valid Line number and a Line activated number? ** Answer: Line activation only means that the number has registered a Line account; Line validity usually means that the account status is normal and messages can be received. Some tools also support activity detection (recently online), which is more accurate. The detection fields of different platforms may be slightly different, please refer to the console instructions.

**Q: How much does it cost to clean a valid Line number? ** A: The cost depends on the number of tests and the unit price of the platform. KK-DATA charges on a per-item basis and does not have a subscription package. The estimated fee will be displayed before the task is submitted. For specific prices, please log in to the console to view real-time data.

**Q: Can I test a large number of numbers at once? ** Answer: Yes. KK-DATA supports up to about 1 million numbers in a single task. It is recommended to conduct small batch testing first and confirm that the test results are in line with expectations before large-scale cleaning.

**Q: Can the cleaned Line valid number list be used directly in the mass sending tool? ** Answer: Yes. KK-DATA supports exporting to CSV, TXT and other formats. The fields include number, uid, gender, etc., and can be directly imported into mainstream bulk sending or CRM tools. Pay attention to confirm the required fields before exporting to avoid omissions.

**Q: After cleaning once, how long can the number remain valid? ** Answer: The number status may change due to user logout, account ban, link change, etc. It is recommended to check 24-48 hours before the event is launched. For long-term preservation, it is more reliable to update the list regularly.

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👉 Log in to the console to start filtering: https://app.kkdata.cc/ If you have any questions, please feel free to contact two-way customer service (messages can be replied): https://t.me/kkdata_robot For official website documents and billing instructions, please visit: https://kkdata.cc/ and https://docs.kkdata.cc/