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About

Deliver timely, personalized information through global SMS/RCS and voice cloud communications. Gain a deeper understanding of your customers from actionable global phone number and subscriber data intelligence. Code once and message your customers at scale using TeleSign’s Messaging API - complete with waterfall delivery between channels. TeleSign Messaging API includes SMS, RCS, and WhatsApp to help you build secure digital communications that connect you with your customers anywhere in the world. Integrate a single Messaging API and start sending reliable, secure SMS, RCS and WhatsApp messages to your customers today. Choose one or all three channels to broaden your programmable messaging strategy and expand your audience. Reach more customers with 120+ optimized points-of-presence and 700+ direct-to-carrier routes​.

About

ZelNum is a web-based verification and data-cleansing platform for businesses, sales teams, marketers, and developers. It helps users verify WhatsApp, Telegram, and phone numbers, check carrier and line-type information, and enrich contact records with country and phone data. Users can run individual checks, upload CSV or TXT files for bulk processing, or connect through the API for automated workflows. With more than 40 verification checks available, ZelNum helps teams clean contact lists, improve data quality, qualify leads, prepare outreach campaigns, and review potential risks. Free manual tools are available, while paid checks use transparent pay-as-you-go pricing with no subscription required. ZelNum provides verification signals, not identity proof, and should be used only with authorized data.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Companies interested in a CPaaS, SMS, and phone number verification solution

Audience

Sales and marketing teams, CRM and operations teams, lead-generation agencies, developers, and businesses that need to verify, clean, and enrich contact lists at scale.

Support

Phone Support Not Supported
24/7 Live Support Supported
Online Not Supported

Support

Phone Support Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Supported

API

Offers API Not Supported

Screenshots and Videos

Screenshots and Videos

No images available

Pricing

No information available.
Free Version Not Supported
Free Trial Supported

Pricing

Pay-as-you-go
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Supported
In Person Not Supported

Company Information

TeleSign
Founded: 2005
United States
www.telesign.com

Company Information

ZelNum
Founded: 2026
Hong Kong
zelnum.com

Alternatives

Alternatives

Categories

Categories

Phone Verification Supported

Cloud Communication Platform Features

Audio / Video Conferencing Not Supported
Call Center Supported
Call Recording Not Supported
Call Routing Supported
Chat / Messaging Supported
Fax Management Not Supported
File Sharing Not Supported
IVR / Voice Recognition Supported

Integrations

WhatsApp Supported
AppMaster Supported
Delinea Cloud Access Controller Supported
DentalTap Supported
Fraud.net Supported
Microsoft Dynamics 365 Marketing Supported
Next Identity Supported
Quickwork Supported
Rayven Supported
Telerivet Supported
Viber Supported
Workers by Delos Supported
Wufoo Supported

Integrations

WhatsApp Supported
AppMaster Not Supported
Delinea Cloud Access Controller Not Supported
DentalTap Not Supported
Fraud.net Not Supported
Microsoft Dynamics 365 Marketing Not Supported
Next Identity Not Supported
Quickwork Not Supported
Rayven Not Supported
Telerivet Not Supported
Viber Not Supported
Workers by Delos Not Supported
Wufoo Not Supported
Claim TeleSign and update features and information
Claim TeleSign and update features and information
Claim ZelNum and update features and information
Claim ZelNum and update features and information