ITG GLOBAL SCREENING

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By Admin March 17, 2026

Want to filter out clean new Line numbers? We'll teach you how to determine if a number is a "dead" or old account.

In cross-border marketing and overseas community customer acquisition, Line account screening is a core preliminary step in customer acquisition. Identifying clean, new Line accounts and avoiding inactive or old accounts is a crucial prerequisite for Line marketing. The core goal of Line account screening is to identify genuine new users with no historical records and accurately eliminate invalid accounts. Effective Line account screening completely eliminates marketing losses caused by inactive or old accounts, ensuring that every outreach targets high-value customers and laying a solid foundation for cross-border marketing.

Why is it necessary to distinguish between inactive and old accounts when screening new Line numbers?

Ignoring the distinction between inactive and old accounts during Line's account screening process can lead to a waste of marketing resources and even trigger platform risk controls. In scenarios such as building Line communities, developing overseas clients, and converting messages, inactive accounts cannot receive messages, and old accounts may belong to non-target users. Neither type of account has conversion value and will lower overall marketing efficiency.
Several common types of inactive or old Line accounts are also key targets for removal during Line's account screening process:
  • Completely inactive accounts: These are accounts that were previously registered on Line but have been canceled, banned, or have been out of service for a long time, rendering them unusable.
  • Inactive old accounts: old accounts that have been used by others, which have not been cancelled but have not been logged in for a long time and are considered "hidden dead accounts" that are unresponsive;
  • Gray market old accounts: Accounts that have been mass-farmed and then abandoned, with residual advertising information and no real user attributes;
  • Re-binding of an old account: After the phone number changed hands, the original owner's Line account was not cancelled, and the new user did not re-register.
If these accounts are not accurately identified through Line's screening process, not only will Line's marketing budget be wasted, but the platform's risk control measures may also be triggered by reaching invalid accounts, causing the previous customer acquisition efforts to be wasted and resulting in unnecessary time and cost losses.

How can I quickly identify if a Line number is a dead number or an old account?

1. Manual Verification Method: Techniques for Screening New Line Numbers in Small Batches

Key advantages : No professional tools required, simple to operate, suitable for small batch screening of up to 100 accounts, can intuitively distinguish between dead accounts, old accounts and clean new accounts, suitable for beginners to use temporarily.
Key identification points : 1. Account search verification: Adding a phone number through the Line client; if it prompts "user does not exist," it's an inactive account. If the account can be searched but the information is outdated and there are no recent activities, it's likely an old account. 2. Profile details check: Clean new accounts usually have blank information or newly added content. Old accounts may have historical profile pictures and nicknames. Gray market old accounts may contain advertising links. 3. Light message delivery: Sending verification messages; if there's no response for a long time, it's an inactive account. If the reply tone is unfamiliar or indicates that you haven't registered for Line, it may be a re-linking of an old account.
Limitations : Extremely inefficient, unable to perform batch screening, and difficult to accurately determine account ownership; it can only be used as an auxiliary means of screening accounts on Line.

2. Third-party interface method: Optimal selection of Line numbers for small and medium-sized projects.

Applicable scenarios : Suitable for screening small to medium-sized accounts from thousands to tens of thousands of accounts, balancing efficiency and accuracy. It can identify dead accounts and old accounts at the same time, and is the mainstream Line account screening method for cross-border Line marketing.
Operation process : 1. Prepare a list of Line phone numbers to be screened, labeling the corresponding country/region area codes, and ensuring the format is standardized; 2. Connect to a compliant third-party Line interface to initiate account status verification, capturing account registration time, login records, and data update traces; 3. Receive the interface results, labeling them as "clean new number/old account/dead number". New numbers must meet the conditions of "recently registered, no historical residual data".
Performance : It can accurately identify more than 90% of dead and old accounts. Line's account screening efficiency is 60% higher than manual screening, which greatly saves labor costs and is suitable for most small and medium-sized marketing needs.

3. Tool Collaboration Method: An Efficient Solution for Large-Scale Screening of New Line Numbers

Applicable scenarios : For large-scale number screening of hundreds of thousands of numbers, professional tools are required to achieve batch removal of dead numbers and old accounts, which is suitable for the number screening needs of Line for cross-border large-scale customer expansion.
Operation Process : 1. Initial Cleaning: Using ITG's full-domain screening tool, empty and inactive numbers are first removed, reducing the core workload of Line number screening and improving the efficiency of subsequent screening; 2. Double Verification: The cleaned numbers are imported into a third-party Line interface, and combined with the data analysis capabilities of ITG's full-domain screening tool, the account status and historical usage traces are verified; 3. Clean Output: Clean new numbers with no history and recent registrations are automatically filtered out, while inactive numbers and various old accounts are removed, directly connecting to subsequent Line marketing stages.
Results : ITG's full-domain screening, in collaboration with the Line interface, reduces Line number screening time by more than 80%, achieves a 92% accuracy rate in identifying clean new numbers, and significantly reduces marketing losses.

How to identify dead or old accounts on Line and avoid misjudging them?

When screening for dead or old accounts on Line, it's important to avoid common pitfalls to prevent misjudgments that could lead to the loss of high-quality new accounts or the retention of ineffective accounts. Mastering the following techniques can improve screening accuracy:
  • Distinguishing between "privacy-hidden" accounts and old accounts : Some users hide their Line information, which needs to be determined in conjunction with the registration time. Recently registered accounts with no historical login records are new accounts to avoid misjudgment.
  • Be wary of the activation of dormant old accounts : Some old accounts may be reactivated. You need to regularly check the accounts through Line to ensure that the account status meets the requirements of a new account.
  • Considering regional usage habits : Users in different regions have different Line usage habits, and some new numbers in certain regions will retain basic information. Therefore, it is necessary to adjust the Line number screening criteria according to regional characteristics.
  • Compliance screening safeguards the bottom line : Line account screening is conducted using compliance tools and interfaces to strictly prohibit the illegal collection of user privacy and avoid platform risk control and compliance risks.

In summary, the key to identifying clean new Line accounts is effective Line account screening, accurately identifying inactive and old accounts. Manual verification is suitable for small-batch screening, third-party APIs are suitable for small to medium-sized needs, and collaborative tools efficiently support large-scale customer acquisition. Using ITG's comprehensive screening tools can further improve efficiency. Effective Line account screening, avoiding the risks of inactive and old accounts, allows cross-border marketing resources to focus on genuine, high-value customers, maximizing the marketing conversion effect on the Line platform.

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.)