See how businesses across industries use MUMU Filter to optimize their outreach and reduce customer acquisition costs.
A fast-growing fashion e-commerce company in Dubai was expanding across the GCC region. They purchased 80,000 phone numbers from lead providers to run WhatsApp promotional campaigns. The result was disappointing — over 40% of messages failed to deliver and their sender reputation was declining rapidly.
They ran their entire database through WhatsApp registration and activity verification:
68% registered on WhatsApp 35% of those were inactiveAfter removing inactive and unregistered numbers, they had 35,000 verified active contacts. Their next campaign achieved a 24% conversion rate — more than double their previous best.
"We were burning thousands of dollars sending messages to numbers that didn't even have WhatsApp. MUMU Filter paid for itself in the first week. Now screening is non-negotiable before every campaign."
— Omar Al-Rashid, Head of Digital MarketingA leading online professional certification platform based in São Paulo collected 50,000 leads from social media campaigns across Brazil, Colombia, and Mexico. Their WhatsApp broadcast strategy was failing — open rates were low and many messages bounced. They suspected their lead data was outdated but had no way to verify.
They screened all 50,000 numbers through WhatsApp registration and activity checks:
38K valid WhatsApp accounts 22K active within 14 daysThey shifted to targeting only active users with personalized course offers. Trial sign-ups increased by 170%, and their monthly WhatsApp sending costs dropped by 45%.
"WhatsApp is how Brazil communicates — but only if the numbers are real. MUMU Filter cleaned up our lists and our enrollment numbers have never been better."
— Carolina Mendes, Growth DirectorA family-owned industrial machinery manufacturer based in Istanbul exported to 30+ countries across Europe, Africa, and Central Asia. Their sales team relied on cold emailing, but response rates had fallen below 2%. They wanted to use WhatsApp and Telegram for direct outreach but had 70,000 international contacts with no platform verification.
Using multi-platform detection, they analyzed their entire contact database:
32K WhatsApp users 18K Telegram users 9K Viber usersThe team tailored their outreach by region — WhatsApp for Middle East and Africa, Telegram for Eastern Europe. Response rates jumped from 2% to 28%, and they closed three major deals within the first month.
"We've been in manufacturing for 40 years, but our sales methods were stuck in the 90s. MUMU Filter showed us exactly where our customers actually communicate."
— Mehmet Yılmaz, Export Sales DirectorA Berlin-based B2B SaaS company wanted to build a Telegram community for their product. They had 35,000 trial user phone numbers collected from sign-ups across Europe, but didn't know which users had Telegram accounts. Inviting unregistered users would create a poor experience and waste their community team's time.
They screened their user base with Telegram registration detection:
22K Telegram registered users 3,400 Telegram Premium users identifiedPremium users were invited to an exclusive beta group first, providing invaluable product feedback. The main community launched with a 68% engagement rate.
"We knew Telegram was big in Europe but had no idea which of our users were on it. MUMU Filter not only found them but identified our most engaged users through Premium status."
— Lukas Weber, Community ManagerA mid-sized logistics company headquartered in Singapore served clients across Southeast Asia, India, and Australia. Their account managers were struggling to reach decision-makers effectively — emails went unanswered, and they didn't know whether clients preferred WhatsApp, Telegram, or WeChat for business communication.
They ran their 60,000 client contacts through multi-platform detection:
SE Asia: 71% on WhatsApp India: 45% on Telegram Australia: 38% on WhatsAppAccount managers now contact each client on their preferred platform. Average response time dropped from 48 hours to 3 hours, and client satisfaction scores improved by 35%.
"Asia is fragmented when it comes to messaging apps — every country has a different favorite. MUMU Filter took the guesswork out of our client communication."
— Priya Menon, Regional Client Services DirectorCommon questions about our phone number screening service.
Our detection accuracy exceeds 99.5% for most major platforms. We query live platform databases in real-time for current and reliable results.
Most batch jobs complete within minutes. Small batches of a few hundred numbers often return results in under a minute, while larger batches scale accordingly.
We support TXT file format. Upload your phone numbers in a single column and our system automatically processes all entries. Results can also be exported.
We support phone numbers from over 200 countries and territories worldwide. Our system automatically detects and normalizes international phone formats.
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