Ukraine WhatsApp Activity Screening Guide

Understand ‘WhatsApp Activity Screening’ in one sentence

“WhatsApp Activity Screening” refers to identifying which numbers correspond to WhatsApp accounts from a batch of phone numbers.Still in actual use recentlyThe core of the detection is not ‘whether the number is registered on WhatsApp,’ but ‘whether there is still activity after registration.’ The former action is calledSift open and pass through, the latter action is the oneScreen for active usersWhen doing refined customer outreach, only filtering for active users can help you further narrow your budget from ‘all registered accounts’ to ‘accounts that are very likely actually in use.’

What does ‘active’ mean in the context of testing?

From the user’s perspective, there is no number called ‘activity level’ on the WhatsApp interface. The only publicly visible statuses are:Current online status、Last Online Time (Last Seen)Personal status information, profile picture, as well as message delivery/read receipts. When third-party tools say ‘filter active,’ they usually refer to filtering throughCapture the changes in the above public signals, to infer whether the account was used within a certain time window.

Taking AppShai products as an example, numbers marked as ‘active’ indicate that the account existsObservable recent activity signalsThe specific determination window and trigger logic are subject to the product’s internal field description, and detailed thresholds are not disclosed in public documents. It should be noted that ‘active’ does not equal ‘currently online,’ but rather refers to aRelatively recentThe status judgment sometimes also includes the verification result of whether the account can be reached normally.

The difference between Active, Online, and Last Seen

These three words are often used interchangeably in the topic of ‘liveness detection,’ but their meanings are completely different:

Concept	Essence	Is it possible to view directly?	Common Misconceptions
Online	The user is currently opening WhatsApp and connected to the internet	Yes, the conversation interface displays directly	“Online” does not mean willing to reply; many people appear online but do not respond.
Last Seen (Last Online)	The last time the user opened WhatsApp	Yes, but users can turn it off in the privacy settings	“Closed once” does not mean it is always closed, nor does it mean the account is inactive.
Active (active)	The account shows activity signals over a period of time	No, it needs to be inferred after multiple observations	Not a searchable label provided by WhatsApp official
Already activated/registered	The number has successfully registered a WhatsApp account	Can accurately detect	Registration ≠ usage, many accounts remain idle for long periods after registration

Simply remember:Being activated is ‘whether it exists,’ being active is ‘whether it is used,’ being online is ‘whether it is present at this moment.’。

Why “registered” doesn’t mean “active”

The most common pitfall for business partners is mistakenly believing that all numbers obtained after “screening and activating” are worth accessing. In reality, the pool of “activated” accounts contains a large number of “inactive” numbers:

• Never used after registration: For example, registering to receive a verification code and never opening it again.
• Backup machine/backup card number: Only occupies space, not used as a daily communication tool.
• Marketing accounts remain: Already restricted by the platform or abandoned by the owner, but the account has not been canceled.
• Equipment is idle: After replacing your old phone, the old number will no longer log in to WhatsApp.

If you only screen activation and then send it to mass calls or outbound calls, the cost structure will be mixed with many “never responding” numbers. This is the most direct business consequence of “registration does not equal being active.”

When is it just a need to “screen and activate”?

The following scenarios do not require active detection:

• Only verify the target numberWhether WhatsApp has reach capabilities；
• Compile statistics on market penetration rates and evaluate channel coverage;
• Extremely low budget, conduct large-scale preliminary screening first;
• Afterwards, it does not rely on real-time user responses but focuses on long-term content engagement.

At this point, opening the screen is the most cost-effective solution.

When must we “screen for active”?

The following scenarios strongly recommend active filtering:

• Every outbound call or message reachFees are charged according to the regulations, cost-sensitive;
• The goal is high-potential contacts, and the list needs to be as clean as possible;
• Do itMultiple rounds of contact(such as activation, recall, notification), and avoid wasting costs on dead numbers;
• You need to overlay other filtering dimensions (such as mobile device, region, avatar, etc.) on top of the active list;
• Business depends on the other party’s actions after seeing messages, such as customer service conversations, promotional reminders, and private domain operations.

In short:To improve conversion rates and control costs, sieve actively; If you only look at penetration and do rough screening, then open up sifting.

How to combine sieve opening with sieve activity

The two stages are superposition, not opposition. The recommendation process is as follows:

1. First round: Sieve opening— Remove “unregistered WhatsApp numbers” and keep qualified accounts;
2. Second round: active sieve activity— For accounts that have been activated, keep accounts with “recent activity signals”;
3. Round Three: Other dimensions— Continue to narrow the list based on the target market’s overlay region, device model, label, and other conditions.

The underlying logic for this is:Narrowing the pool layer by layer, each round of screening costs more precise candidate sets。 Directly checking the activity of all numbers costs higher per message; Only enabling filtering and mass sending wastes the reach budget.

The technical frontiers of active detection

One fact needs to be clarified:WhatsApp does not provide a public interface for third parties to check the “activity level” of a certain number.。 All third-party tools’ “active” judgments are indirectly inferred based on observable signals. Therefore, the results should be viewed in three levels:

It can be accurately judged：

• Whether the number is registered for WhatsApp;
• Whether the account profile is complete (profile picture, status, nickname);
• Whether conversations can be initiated normally (verifiable in some scenarios).

It can only be approximatedly judged：

• The “active” label itself;
• Approximate activity frequency of the account;
• Common active periods.

These are the results of signal inference, not official platform data.

Impossible to judge：

• User chat content, contacts, call records;
• “Online duration” down to the minute;
• Whether the user actually saw your message (unless the other party replied, or the system returned as read).

Using “approximate judgments” as “precise data” is the most common cognitive error in the screening process.

Privacy and compliance considerations

When discussing compliance with “active screening,” one premise must be based:The number you handle must come from a legitimate sourceFor example, customers voluntarily retaining funds, authorized lists, and publicly disclosing business information. Unauthorized bulk acquisition of personal phone numbers and marketing reach violates data protection laws in most jurisdictions.

Key points to note:

• Respect user privacy settings: Users have legal rights to disable Last Seen, online status, and read receipts, which should not be bypassed during filtering.
• Control the reach frequency: Launching high-frequency sessions in bulk can easily trigger WhatsApp risk controls, resulting in number restrictions. Business Reach prioritizes using the WhatsApp Business API and complies with official message template standards.
• Do not use it for harassment or fraud: Screening activity is a data quality management tool, not a “targeted victim hunting” tool. Illegal use may face platform bans and legal accountability.
• Clearly state the other person’s identity: Even if the other party is an “active” user, the first contact should explain the purpose and identity, and retain the channel for unsubscribe or refusal.

Clarification of high-frequency questions

Q: Will the other party always reply to the “active” numbers you screen out?
Not necessarily. “Active” only means the account has been used recently, not that the other party is interested in your business. The final response rate also depends on industry match and reach copy.

Q: If a user turns off Last Seen, can they still be considered active?
Partially yes. Disabling Last Seen will eliminate a key signal, but if other public signals (such as status updates or online status frequency) change, comprehensive inferences can still be made. Accounts with insufficient signal will fall into the “insufficient evidence” zone, not the “active” zone.

Q: Are active screening and online screening the same thing?
No. “Online” is a snapshot of a moment’s status, while “Active” is a comprehensive judgment over a period of time. Filter lists prioritize activeness, while activity reminder scenarios are better suited for online status.

---

AppShai （AppShai）It is a globally leading number ecosystem processing platform, deeply integratedGlobal mobile number range coverage, batch number generation, intelligent deduplication, and multi-dimensional comparisonCore capabilities, providing coverage for global enterprises and individual clients220 countries and regionsThe Number Checking and verification service.

The system is currently compatible with the following mainstream social and business applications, including:
WhatsApp、LINE、Telegram、Viber、Zalo、Signal、Facebook、Messenger、Instagram、Microsoft、Binance、iMessageetc.

We will continue to develop and support more platforms, stay tuned. Platform features cover full-dimensional filtering scenarios, supportingEnable filtering, active filtering, interaction filtering, gender filtering, avatar filtering, age filtering, online status filtering, precise tag filtering, online duration filtering, power-on detection filtering, inactive number filtering, mobile device model filteringetc., meeting various business needs from basic to advanced levels.

We provideSelf-service screening mode, agency-operated screening mode, refined layering mode, and customized solution mode, flexibly adapting to different usage scenarios for individual developers, small and medium teams, and large multinational enterprises. The core advantage lies inOne-stop integration of global mainstream application ecosystems, providing real-time high-precision screening results, helping you significantly reduce customer acquisition costs and improve global digital operation efficiency.