Cross-platform remarketing list management: Use the filtering service to clean invalid numbers and improve the secondary touch conversion rate

After overseas companies accumulate a batch of user numbers, they often face an embarrassing situation: a large number of numbers in the list have expired, and users have changed their numbers, logged out, or no longer use the target platform**. Sending remarketing messages directly to these numbers not only wastes your budget, but can also damage your brand reputation. What’s the solution? The answer is Screening service - through batch verification of the validity, activity and gender of numbers on Telegram, WhatsApp, Line, Zalo and other platforms, it cleans out a precise list of people who can be reached, so that every remarketing budget is spent wisely.

This article will fully explain how to use the screening service to create an efficient remarketing list management system from pain point analysis, operation steps, applicable scenarios to precautions.

What are cross-platform remarketing lists? Why do you need screening services?

The remarketing list refers to the user numbers that have interacted with your brand (such as visiting the website, joining a community, adding contact information) but not ultimately converting. Theoretically, the trust cost of this group of users is lower, and the conversion rate of second contact is much higher than that of new potential customers. However, in actual operation, the validity of the number will decline sharply over time:

• User changes mobile phone number or SIM card
• Users have logged out of their Telegram/WhatsApp/Line accounts
• Users who keep their number but no longer use the platform (e.g. migrating from Telegram to WhatsApp)

If messages are sent directly without filtering, a large number of contacts will fall on invalid numbers, resulting in waste of costs and account risk (frequent messages sent to invalid numbers may trigger platform restrictions). This is the core value of the number screening service: it can batch verify whether each number is activated/registered, recently active, and even identify gender/age and other portraits before sending, so that you can only send messages to “living people”.

Three core pain points of remarketing list management

Invalid number: May lose 5%-10% per month

A list of numbers collected 3 months ago, the validity ratio may have dropped to less than 70%. Different platforms have different rates of churn: Telegram users change their numbers less frequently, but WhatsApp users may abandon their old accounts due to changing countries/operators. If you don’t check it regularly with a screening service, every message you send has a 30% probability of being “air”.

Loss of activity: users change platforms or no longer use them

Even if the number is still in the operator’s database, the user may have stopped using the social app. For example, a user joined your group using Telegram last year, but this year he only uses WhatsApp. If you don’t check the activity, you will still treat him as an active Telegram user and send messages in vain. The activity detection in the number screening service (such as specifying the last 7 days, 30 days or 90 days) can help you identify those numbers that have been “silent”.

Data redundancy: Mixed lists of multiple batches lead to repeated deductions

Many teams will repeatedly collect numbers from different channels (official website forms, advertising responses, offline activities). If duplication is not done when importing screening tasks, the same number may be repeatedly detected in multiple tasks, resulting in unnecessary deductions. At this time, the Data Deduplication Warehouse comes in handy - it can automatically compare historical records across tasks to ensure that each number is only detected once, saving balances.

How to use the filter service to clean and activate the remarketing list? (core method)

Here are four key steps to revamp your remarketing lists with filtering services for Telegram, WhatsApp, Line, Zalo, iMessage, and more.

Step 1: Number preparation and platform selection

Organize the original list into a CSV or TXT file, make sure the numbers are formatted correctly (including country code, starting with +86 or 86, for example). Then choose the corresponding platform according to your remarketing channel: if the target is WhatsApp group messaging, choose WhatsApp detection; if it is a Telegram community secondary invitation, choose Telegram detection. The maximum number of supported single tasks is about 1 million, so you can submit with confidence.

Step 2: Configure screening tasks (validity + activity + gender)

When creating a job in a screening platform (such as KK-DATA), you can usually select multiple detection types:

• Activation detection: Determine whether the number is registered on the platform.
• Activity Detection: Set a time window (such as 7 days, 30 days) to filter out recently active users.
• Gender Identification: Some platforms (Telegram, Line, Zalo, etc.) can identify the user’s gender and age range for targeted push content.

For example, for the targeting of “men around 30 years old”, you can enable the age field in gender detection to assist filtering, but please note that this is not ID card-level accuracy, but an inference based on the user’s public information. After the configuration is completed and the task is submitted, the system will return the estimated deduction amount (see the real-time price on the console for details).

Step 3: Use data to deduplicate warehouses and merge historical lists

If you have multiple batches of historical lists (such as last month’s remarketing list, last month’s abandoned purchase list), it is recommended to import them into the deduplication warehouse first. The deduplication warehouse will automatically compare the numbers of all completed tasks and mark duplicate numbers to avoid further deductions for this task. In this way, every time you submit a new task, only the truly “fresh” numbers will be detected, maximizing the efficiency of balance utilization.

Step 4: Export results and distribute to remarketing channels

After the task is completed, the system generates a result file. Typically exported to CSV or TXT, the fields include:

• number
• Whether it is enabled
• Activity level (e.g. high activity, low activity)
• Gender
• age
• Platform unique ID (tgid, wsid, uid, etc.)

Filter out the “unactivated” or “inactive” numbers in the results, keep only the “activated + active” numbers, and then import them into your remarketing tools (such as Telegram broadcast, WhatsApp batch sending, iMessage push). Note that the export fields of different platforms are subject to the console.

Which business scenarios are most suitable for using the screening service for remarketing?

The following three scenarios are the most common in practice:

1. Awakening old customers before e-commerce sales: Suppose you have 50,000 mobile phone numbers of old customers and want to send promotional coupons through WhatsApp or iMessage. First use the number screening service to detect which numbers are still using iMessage (blue number) or WhatsApp is active, and then only send messages to these users. Conversion rates often increase 2-3x while costs drop significantly.

2. Community secondary invitation (Telegram): You have a list of users who have participated in a Telegram live broadcast event, and you want to invite them again when you launch a paid community later. Use the Telegram activity + gender detection of the screening service to filter out users who have been active in the past 30 days and whose gender matches the target profile (such as an entrepreneurial community with a majority of men), and then export the tgid to directly recruit groups in batches.

3. Independent site abandoned purchase recovery: The user did not pay after adding the shopping cart on the website, and you left their mobile phone number. But the user may have only signed up for Line and not WhatsApp. Use the screening service cross-platform detection (such as detecting WhatsApp, Line, and Telegram at the same time) to find the platform on which the user is most likely to be active and send accurate recovery information.

Things to note when using the filter service to manage remarketing lists

• Billing method: Charges per item, no subscription package. The unit price of each platform and each detection type is different, and the real-time price of the console shall prevail. The estimated cost will be displayed before the task is submitted.
• Deposit and Balance: Supports USDT (TRC20) recharge, with a minimum of about 50 USDT. New tasks cannot be submitted when the balance is insufficient.
• Avoid repeated import: It is recommended to use the deduplication warehouse cleaning before each submission to prevent the same number from being detected and deducted multiple times.
• Task quantity control: Although millions of numbers can be submitted at a time, it is recommended that each batch be controlled at 100,000-500,000 to facilitate quick results and timely adjustment of strategies.
• Export data anonymization: The export file may contain sensitive fields such as tgid and wsid. Please pay attention to confidentiality and comply with local data compliance requirements.

FAQ

**Q: There are both Telegram and WhatsApp numbers in the remarketing list. Can I use the same task to detect them? ** Answer: Currently, each screen number task needs to specify a single platform. It is recommended to create tasks separately according to the platform. However, the number segment source can reuse the global number generation module.

**Q: Can the number screening service detect whether numbers from several months ago are still active? ** Answer: Yes. Telegram/WhatsApp activity detection supports custom time windows (such as the last 7 days, 30 days, 90 days, etc.), and you can choose the appropriate window according to the remarketing rhythm.

**Q: Can the data deduplication warehouse deduplicate tasks across different filter numbers? ** Answer: Yes. The deduplication warehouse automatically compares the numbers generated by historical tasks to avoid repeated deductions for the same number in multiple detections.

**Q: What fields can be seen in the export results? ** Answer: The output fields of different platforms are different, common ones include: whether to register, activity level, gender, age, tgid/wsid, etc. The details are subject to the console export file.

**Q: I only have a few thousand numbers, is it worth using the number screening service? ** Answer: Even if there are only a few hundred entries, a large number of invalid numbers can be filtered out and the remarketing ROI can be improved. The pay-per-item model is equally friendly to small lists.

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The essence of remarketing is to use the least cost to reach the users who are most likely to convert. Filtering service helps you filter out “possibly invalid” numbers and only retains a precise list of “valid and active” numbers. If you have an old list that has not yet been activated, you might as well use a number screening service to clean it immediately. You will be surprised at the high proportion of invalid numbers - and the rest are real potential customers.

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