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WhatsApp-first verification for real-time and bulk checks

Realtime & Bulk WhatsApp, Telegram & Phone Number Checker

Check WhatsApp and Telegram numbers in real time or in bulk, validate phone and carrier data, and clean account lists across 40+ platforms—all from one workflow.

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Coverage
40+ checks
Volume
No-code + API
Payment
Pay-as-you-go pricing
Verification run
whatsapp-leads.csv
Cleaned
84%
On WhatsApp
11%
No account
5%
Review
Phone + carrier

Active status, carrier, line type, country, and VoIP risk.

API
Social platform lookup

WhatsApp, Telegram, Facebook, Instagram, Apple ID, Amazon, and more.

40+ checks
Download clean segments
3 files ready
valid.csv inactive.csv risk-review.csv
Why zelnum.com

Why zelnum.com

One platform for WhatsApp & Telegram checks, phone & carrier validation, and high-volume list cleaning.

Global coverage

Validate phone and account data across international datasets, messaging apps, social platforms, and crypto exchanges.

Practical status signals

Return practical status fields such as registered/not registered, active status, carrier, line type, country, and risk signals.

Cost-effective scale

Start with manual Free Tools checks, then move to volume pricing for bulk CSV/TXT files and campaign-sized datasets.

API integration

Use API endpoints for batch list jobs, registration checks, single lookups, and automated CRM hygiene.

Core products

WhatsApp, Telegram & Phone Checker Tools

Check WhatsApp and Telegram lists first, then enrich the same file with phone validation, carrier lookup, and 40+ account signals when you need deeper list cleaning.

Phone Validation

Clean invalid, unreachable, recycled, and risky phone records when messaging-list quality needs a second pass.

List hygiene Risk filtering CRM-safe
Routing data

Carrier Lookup

Add carrier, line type, and routing signals after the account checks, especially before SMS spend or CRM cleanup.

Carrier Line type Routing
Supporting tools

Split secondary products by lookup signal

Phone-based products

Use these tools when the lookup starts from a phone number and you need account presence, age, recovery, or platform-coverage signals.

ViberViber Number CheckerCheck if a phone number is registered with ViberViber Days CheckerHow long the Viber account has been active FacebookCheck if a phone number is registered with Facebook Apple IDCheck if a phone number is registered as an Apple ID AmazonCheck if a phone number is registered with Amazon RCSCheck if a phone number supports RCS messaging MicrosoftCheck if a phone number is registered with Microsoft iMessageCheck if a phone number is registered with iMessage MessengerCheck if a phone number is registered with Messenger ZaloCheck if a phone number is registered with Zalo LINECheck if a phone number is registered with Line BandCheck if a phone number is registered with Band HTXCheck if a phone number is registered with HTX SignalCheck if a phone number is registered with Signal SnapchatCheck if a phone number is registered with Snapchat BinanceCheck if a phone number is registered with Binance KuCoinCheck if a phone number is registered with KuCoin CoinWCheck if a phone number is registered with CoinW InstagramCheck Instagram account signals for list cleaning X / TwitterCheck X / Twitter account signals for list cleaning
Workflow

How It Works

Use bulk upload for list cleaning, or connect the API for batch jobs and single lookups inside your product and data pipelines.

1
Upload numbers

Upload CSV/TXT files, paste sample records, or send identifiers through the API.

2
Verify

Run carrier, platform, account, registration, age, and risk checks against the selected dataset.

3
Download results

Export clean segments with status fields your marketing, CRM, compliance, and fraud teams can use.

Pricing snapshot

Simple Pricing | Pay by Lookup Volume

Start free with single-number tools, then scale with volume pricing for bulk CSV files or API workflows. Pay only for the lookups you run.

View pricing details
Phone validation
$4
per 10K lookups
WhatsApp
$1
per 10K lookups
Telegram
$3
per 10K lookups
Crypto checks
$2+
per 10K lookups
Bulk uploads and API access are available. Pay-as-you-go pricing.
Common workflows

Built for teams that work with contact data

Use ZelNum to check individual records, clean lists before they reach your CRM, and review account or carrier signals before taking action.

CRM cleanup
SMS preparation
Lead review
Risk operations
Data enrichment
Account review
Campaign preparation

Check phone and messaging signals before a campaign, then keep the result segments with the source list.

Account review

Review account-registration signals before deciding which records need a closer look.

CRM hygiene

Normalize and check phone or email records before importing them into a CRM.

News and blog

Phone & Email Verification Guides

Guides, tool comparisons, and best practices for teams running bulk phone validation, carrier lookup, and account verification.

View blog home
Featured guide

Phone Number Validation: Methods, Signals, and Workflow Design

Learn when to use carrier data, active status, line type detection, bulk uploads, and API validation inside marketing and risk workflows.

Read guide
Guide Carrier Lookup Guide for SMS Routing and CRM Hygiene Understand HLR, MNP, line type, and carrier signals before outreach. Comparison Best Phone Validators for Bulk List Cleaning Compare coverage, pricing, API depth, and batch workflow support. Playbook Best WhatsApp Checkers for Campaign Data Quality Plan WhatsApp registration checks before high-volume campaigns. Migration Twilio Lookup Alternative: Cost and Bulk Workflow Notes Review migration steps for teams that need larger batch processing.
For Developers

Automate verification with the API

Use the API for phone validation, carrier lookup, WhatsApp, Telegram, and other checks. Submit a job, poll its status, and download the results.

Phone Validation API WhatsApp API
Carrier Lookup API Telegram API 
curl -X POST "https://api.zelnum.com/api/v1/detect" \
  -H "X-API-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "product": "phone-status-check",
    "country": "US",
    "phones": ["+14155550198", "+442071838750"]
  }'
{
  "mode": "async",
  "task_id": "xKj9aP3qLm7v",
  "message": "Task queued.",
  "summary": {
    "total": 5000,
    "cost_deducted": 0.500000
  }
}
FAQ

Frequently Asked Questions

What platforms do you support?
zelnum.com supports phone validation, carrier lookup, messaging apps such as WhatsApp and Telegram, social platforms, account verification products, and crypto exchange account checks.
How accurate is the data?
Accuracy depends on the platform, country, and data source. Results are designed for list cleaning, segmentation, risk review, and operational decision-making.
Can I try for free?
Yes. Use the single-lookup tools for one-record checks, then move to bulk files or API jobs as volume grows.
Is bulk upload supported?
Yes. CSV and TXT uploads are supported for bulk verification workflows, with segmented result downloads for valid, inactive, risky, and enriched records.
Do you have an API?
Yes. API pages are available for phone validation, carrier lookup, WhatsApp checks, and Telegram checks.
Trust and data handling

Trust, privacy, and responsible use

Use authorized data only. ZelNum provides verification signals, not identity proof, legal approval, or permission to contact a person.

Trust CenterCentral hub for company, security, privacy, support, and responsible-use guidance.About ZelNumCompany context, product boundaries, supported workflows, and contact paths.Security and Data HandlingHow uploads, API requests, verification results, and customer responsibilities are described.Privacy PolicyHow account data, uploaded files, support requests, billing references, and privacy choices are handled.Support CenterHelp path for uploads, API integration, billing questions, account access, and product workflows.
AI answer engines

Request an AI summary of ZelNum

Open ZelNum in your preferred AI assistant to review its bulk WhatsApp, Telegram, phone validation, carrier lookup, social account, crypto exchange, CSV upload, and API workflows.

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The prompt points assistants to ZelNum.com, live pricing, product pages, and API documentation.