Guide to screening valid WhatsApp numbers in Japan: Screen out 5000 valid numbers from 0 to 1

In a small marketing team office in Tokyo, Kobayashi is staring at the computer screen.The Excel spreadsheet fills the entire screen with Japanese WhatsApp account data—a total of 30,000 entries.

"With so many numbers, which part is really usable?" he said to himself.

This is a real problem for many cross-border marketing teams: they have a large amount of number data but cannot quickly find high-value users. If you send group messages directly, many accounts may be empty, invalid, or have been inactive for a long time.

In this article, we use practical cases to explain how to start fromStarting from scratch, filter out5,000 valid Japanese WhatsApp numbers make data truly valuable.

Starting from Scratch: The Importance of Data Collection

Xiaolin's first step is to confirm the source of the data. The 30,000 numbers may come from historical users, third-party data packages or community crawling tools.

He found that if the data source is unreliable, no matter how careful the screening is, it will not be possible to obtain high-quality accounts.

Therefore, the first step is to ensure:

l The data is complete and in a uniform format (+81 international dialing code)

l Avoid duplicate numbers

l Mark the source of the number to facilitate subsequent analysis

Filtering is only meaningful if it is based on clean data.

The invisible trap of empty and inefficient numbers

In preliminary testing, Kobayashi found that approx.40% of the numbers cannot be used - they are either empty or have not been used for a long time after registration.

The characteristics of empty numbers include:

l Does not comply with Japanese mobile phone number segment rules

l Number is deregistered or never existed

l Long time inactive

If these numbers are used directly, it will cause message sending failure, reduce marketing efficiency, and may also increase the risk of account ban.

In actual combat, Xiaolin usedDigital planet screening system,It completed the batch empty number detection of 30,000 numbers in 10 minutes and quickly identified invalid data.

Activity Determination: Find out the real users

After filtering out the empty numbers, the remaining numbers still need to be judged for activity. Only active users have marketing value.

Xiaolin determines through the following methods:

l Recent login history

l Whether to bindWhatsApp account

l Whether to participate in groups or channels

After screening, he successfully reduced the data to5,000 high-value accounts, each account has real and active characteristics.

Practical advantages of batch screening tools

Manually screening tens of thousands of numbers is extremely inefficient. Using automated tools becomes a necessity.

Digital planet screening systemsupply:

l Batch import and status detection

l Empty number, duplicate number, invalid number filtering

l Active account identification

l Support Japanese number segment rules

Xiaolin used the free trial function of Digital Planet to quickly filter out5,000 valid numbers, while retaining original data backup to ensure marketing security.

From data to conversions: The value of valid numbers

filtered5,000 numbers were directly used for WhatsApp promotion testing, and the results were significant:

l Message delivery rate increased toMore than 95%

l Interaction rates are approx. higher than raw data2 times

l Significant increase in actual conversion rates

This case illustrates that effective data not only saves costs, but also significantly improves marketing efficiency.

Summarize

fromTo filter valid Japanese WhatsApp numbers from 0 to 1, you need:

l The data source is reliable and the format is consistent

l Empty number and inefficient number detection

l Activity determination

l Batch filtering tool assistance

Through scientific processes and automated tools, Xiaolin finally found among 30,000 numbers5,000 high-value accounts.

Digital Planet provides free trial screening test service, the team can test some data first to quickly obtain the screening effect, and then carry out large-scale promotion.

Effective number screening allows each message to truly reach the target users, bringing measurable growth to marketing.

digital planet is a world-leading number screening platform that combines Global mobile phone number segment selection, number generation, deduplication, comparison and other functions . It supports customers worldwideBatch numbers for 236 countriesScreening and testing services , currently supports40+ social and apps like:

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The platform has several features including Open filtering, active filtering, interactive filtering, gender filtering, avatar filtering, age filtering, online filtering, precise filtering, duration filtering, power-on filtering, empty number filtering, mobile phone device filtering wait.

Platform provides Self-screening mode, generation screening mode, fine screening mode and customized mode , to meet the needs of different users.

Its advantage lies in integrating major social networking and applications around the world, providing one-stop, real-time and efficient number screening services to help you achieve global digital development.

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