ITG GLOBAL SCREENING

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By Admin March 17, 2026

How to bulk remove phone numbers that haven't activated Line? A clever trick to save on marketing costs.

In cross-border marketing, Line is a core channel for reaching customers in East and Southeast Asia, and mobile phone numbers are the core carrier for bulk outreach. Line number screening is a key means of efficiently eliminating inactive mobile phone numbers and avoiding resource waste. Line number screening can identify activated accounts from the source, ensuring that marketing budgets are accurately targeted; conversely, ignoring pre-screening with Line numbers will result in significant costs being spent on inactive mobile phone numbers, leading to a "high investment, low conversion" dilemma. Therefore, mastering Line number screening techniques and bulk eliminating inactive mobile phone numbers is a core strategy for reducing costs and increasing efficiency in cross-border marketing.

I. Why is it necessary to remove phone numbers that have not activated Line in batches?

In cross-border scenarios such as Line community marketing, bot outreach, and bulk friend adding, businesses often push information in bulk via mobile phone numbers. However, mobile phone numbers that are not activated with Line will render all marketing efforts futile. The core purpose of Line's number filtering is to eliminate these invalid numbers in advance.
Common situations where a mobile number is not activated or is associated with an invalid number include:
  • The phone number has never been activated for Line, making it a completely invalid number. Messages cannot be delivered, directly wasting push notification costs.
  • The number was once active on Line but has been deactivated and the account history has been cleared, which is equivalent to not being active at all. There is no response when contacted.
  • The phone number is either invalid or out of service, so even if you want to activate Line, you cannot use it; it is a doubly invalid number.
  • Virtual numbers/SMS verification code platform numbers often cannot be properly activated on Line, have poor stability, and are prone to triggering platform risk control measures.
If these numbers are not identified in advance through Line's screening process, they will consume more than 40% of the marketing budget on average, interfere with data statistics, lead to decision-making biases, render the pre-emptive protection function of Line's screening ineffective, and drag down the overall progress of cross-border marketing.

II. Which unenabled identification dimensions should be focused on when using Line for number screening?

Batch removal of Line numbers with unactivated phone numbers is not simply a matter of verifying activation status. It requires a comprehensive judgment based on multiple dimensions to ensure accurate removal, high-quality retention, and compliance and efficiency.
  • Core Dimension 1: Precise Verification of Activation Status. This is the core of Line's number screening process. By connecting to Line's compliant interface, it directly determines whether a mobile number has been successfully activated for Line, eliminating over 80% of unactivated numbers at once, controlling the problem at its source.
  • Core Dimension Two: Basic Number Validity Verification. Simultaneously verify whether the mobile number is invalid or suspended, avoiding misjudgments of "not activated" due to the number itself being invalid, improving the accuracy of Line's number screening and reducing the omission of valid accounts.
  • Core Dimension Three: Security and Compliance Screening. Virtual numbers and numbers from SMS verification platforms are eliminated. These numbers are often unable to activate Line and may also affect the main account's risk control. This ensures that Line's number screening process eliminates invalid numbers and avoids risks.

III. What are some practical tips for bulk removing unactivated mobile phone numbers?

In the context of cross-border marketing, Line's number screening can adopt a combination of "tool-based and manual" approaches to balance batch processing efficiency and accuracy, and adapt to different scales of needs for removing inactive numbers.
  • Tip 1: Use professional tools for batch screening and efficient cost control. For screening millions of Line numbers, ITG's full-domain screening can be used. It can connect to Line's compliant interface and operator data to batch verify the activation status of mobile phone numbers, whether they are virtual numbers, and automatically mark and remove inactive numbers with an accuracy rate of over 95%. The efficiency is 50 times higher than manual screening, which greatly saves screening time.
  • Tip 2: Lightweight manual verification, low-cost adaptation. For small to medium batches of numbers, you can manually try adding them as Line friends. If the message "Account does not exist" appears, it means the phone number is not activated. The operation is simple and requires no complicated technology. It can be used as a supplementary method to Line number screening and is suitable for projects with small budgets.
  • Tip 3: Optimize data preprocessing to improve efficiency. First, standardize the format of the number list, remove duplicate values, and calibrate the regional codes. Then, perform Line screening to avoid duplicate verification and invalid operations, ensuring that no unactivated numbers are missed and that valid accounts are not mistakenly deleted.

IV. How to further reduce marketing costs after using Line for number screening?

After removing unactivated phone numbers in batches, it is necessary to leverage the results of Line's number screening to optimize operational strategies, minimize costs, and ensure that every penny of the budget is used on high-quality activated accounts.
  • Tiered targeting, focusing on high-value accounts. Based on Line's screening results, activated accounts are categorized by activity level, with high-activity accounts receiving priority for pushing core content, thus avoiding resources being scattered across low-value accounts.
  • Regularly review and update the list to keep it up-to-date. Phone number activation status changes dynamically, so it's recommended to conduct a Line number review monthly, removing newly added but not yet activated or cancelled numbers, and adding newly activated, accurate accounts.
  • Operate in compliance with regulations to avoid additional losses. After filtering out risky numbers using Line's number screening system, maintain and operate your accounts in accordance with Line's platform rules, avoiding frequent mass messaging and sending inappropriate content to prevent secondary costs from account suspension.

V. Conclusion

The key to bulk removal of phone numbers without Line accounts lies in effectively utilizing Line's number screening tool. Through multi-dimensional and precise identification, cost loopholes are plugged at the source. Leveraging ITG's comprehensive screening to improve Line number screening efficiency, combined with tiered operations and regular rescreening, not only can ineffective spending on inactive numbers be eliminated, but also the focus can be placed on high-quality customer groups. In today's high-cost cross-border marketing environment, mastering this Line number screening strategy enables precise targeting, efficient cost reduction, and a steady breakthrough in the global market.

ITG Global Screening is a leading global number screening platform that combines global number range selection, number generation, deduplication, and comparison. It offers bulk number screening and detection for 236 countries and supports 20+ social and app platforms such as WhatsApp, Line, Zalo, Facebook, Telegram, Instagram, Signal, Amazon, Microsoft and more. The platform provides activation screening, activity screening, engagement screening, gender/avatar/age/online/precision/duration/power-on/empty-number and device screening, with self-screening, proxy-screening, fine-screening, and custom modes to suit different needs. Its strength is integrating major global social and app platforms for one-stop, real-time, efficient number screening to support your global digital growth. Get more on the official channel t.me/itgink and verify business contacts on the official site. Official business contact: Telegram: @cheeseye (Tip: when searching for official support on Telegram, use the username cheeseye to confirm you are talking to ITG official.)