Number Validator

Only work with valid phone numbers

Don’t waste time on poor data. Voiso’s Number Validator ensures your calling lists only include valid numbers to boost your talk time and campaign performance.

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Clean calling lists for efficient campaigns
Vetted contact lists
Validate numbers to ensue only legitimate, active contacts are included in campaigns.
Enhanced campaigns
Minimize wasted effort and maximize talk time for your outbound campaigns.
Detailed number info
Optimize outreach with information about a numbers’ country, carrier, and type.
Save on costs
Avoid bad numbers and the unnecessary expenses that come from dialing them.
Streamlined workflows
Easily upload and validate large contact lists in bulk using our intuitive platform.
Improve compliance
Reduce the risk of contacting opted-out contacts or whose data is inaccurate.

Validate numbers, optimize outreach

Quick number validation

Don’t waste valuable time and resources on calls that go nowhere.

Voiso’s Number Validator ensures your contact lists are accurate and up-to-date, so your agents connect with real people, every time.

No more frustration, no more dead ends — just higher conversions and a more efficient campaign.

Unlock contact insights

Our Number Validator provides detailed information about each contact, including country, carrier, number type, and reachability status.

Use these insights to personalize your outreach, target specific demographics, and make data-driven decisions that drive results.

Clean lists, optimal performance

By eliminating invalid and unreachable numbers from your campaigns, our Number Validator helps you optimize your budget and maximize your ROI.

Experience the peace of mind that comes with knowing your contact data is clean, reliable, and ready to deliver results.

Customers
Hear from Voiso
customers
Our platform streamlines the management of high-performing contact centers, allowing businesses to deliver more value to their customers.
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4x
More outbound calls per hour
“We have been using Voiso for years, and it has helped drive our NPS. I highly recommend it to any looking for a reliable call center software solution.”
Vanessa, Head of Hotel Products
50+
Increase in agents productivity
“With Voiso, we have finally found a solution that covers our call center needs. Improved agent productivity by 50+% in just a few weeks”
Bernardo, Customer Experience Director
+16
Opened new markets
“Voiso is a cost-effective customer experience solution that allows us to provide service across 16 markets from the US to the Middle East.”
Tuncay, Director
100+
Agents, scaled from 15
“100% of our bookings were made by phone. With Voiso automation, we grew from 15 agents based on Bali into a 100+ employee omnichannel contact center operating across continents.”
David, COO at Karma Group
Integrations
Seamless integration with your CRM
Sync with your favorite apps in just a few clicks to leverage the power of Voiso’s contact center features.
Integrations
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FAQs on Voiso's Voiso's Number Validator

What is Number Validator?

Voiso’s Number Validator is a powerful tool that helps you ensure the accuracy and quality of your contact lists. It validates phone numbers in bulk, checking for formatting errors, confirming allocation to service providers, and providing valuable insights like country, carrier, and reachability status.

How does Number Validator work?

Simply upload your list of phone numbers in a CSV file, choose your desired level of validation (Number Profile or Line Activity), and submit your request. Our system will quickly process your list, automatically checking for errors and providing a detailed report on each number.

What are the benefits of Number Validator?

  • Boost campaign success: Eliminate wasted calls and connect with real people, leading to higher conversions and more efficient campaigns
  • Unlock valuable contact insights: Gain a deeper understanding of your audience with detailed information about each number, including location, carrier, and reachability status
  • Clean lists, clear savings: Reduce dialing costs and optimize your budget by removing invalid and unreachable numbers
  • Improved compliance & data protection: Mitigate risks by ensuring your contact lists are accurate and up-to-date, helping you stay compliant with data protection regulations.
  • Tailored validation options: Choose between Number Profile and Line Activity to get the level of detail you need
  • Easy to use: Validate large lists in bulk with a user-friendly interface and actionable CSV reports

How phone validation helps meet regulations?

Phone validation ensures compliance by identifying and removing invalid, inaccurate, or opted-out numbers from your contact lists. This reduces the risk of contacting individuals who have not provided consent, helping you adhere to regulations like TCPA, GDPR, and other data protection laws. By maintaining clean and verified data, you avoid penalties, enhance customer trust, and meet legal requirements for responsible outreach.

What is the role of phone validation in omnichannel systems?

Phone validation ensures that only accurate and active contact data flows across all channels—voice, SMS, chat, and social platforms. This improves message deliverability, reduces failed interactions, and enhances customer experience by enabling seamless communication. Clean, validated data also supports personalized outreach and ensures compliance across all channels, driving better performance in omnichannel campaigns.

How can validators improve ROI?

Validators improve ROI by eliminating invalid and unreachable numbers, ensuring agents focus only on real, active contacts. This reduces wasted call attempts, minimizes operational costs, and increases connection rates. Additionally, insights like carrier and number type allow for targeted outreach, optimizing campaign performance and driving higher conversions, resulting in a more efficient use of resources and improved returns.

What KPIs to track for monitoring success?

  1. Validation Rate: Percentage of valid numbers in the contact list.
  2. Invalid Number Rate: Percentage of numbers flagged as incorrect or unreachable.
  3. Connection Rate: Number of successful calls or message deliveries to validated contacts.
  4. Cost Savings: Reduction in expenses from avoiding invalid numbers.
  5. Agent Talk Time: Increase in productive time spent connecting with valid contacts.
  6. Campaign Conversion Rate: Percentage of validated contacts that lead to successful outcomes (e.g., sales or appointments).
  7. Return on Investment (ROI): Improved campaign efficiency and results compared to total validation costs.

How to choose the right phone number validator?

  1. Accuracy: Ensure the validator can reliably identify active, valid numbers with minimal false positives.
  2. Data Insights: Look for tools that provide detailed information like carrier, country, number type, and reachability.
  3. Scalability: Choose a solution that can handle bulk validation for large contact lists efficiently.
  4. Compliance: Verify the tool helps meet regulations like TCPA and GDPR by identifying opted-out or invalid contacts.
  5. Integration: Ensure it integrates seamlessly with your CRM, dialers, and other systems.
  6. Ease of Use: Opt for a platform with an intuitive interface for quick setup and smooth workflows.
  7. Cost-effectiveness: Evaluate pricing based on validation volume and ROI improvements.