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WhatsApp, Telegram & Phone Number Checker

Check WhatsApp, Telegram, and phone numbers in real time or in bulk. Validate each record against a live network response, and support CRM hygiene, fraud prevention, and risk review — 44 check tools, one workflow. Every check runs live at query time: the network's answer right now, not a cached guess.

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

Live status now, plus a per-row verdict you can count and reconcile.

API
Social platform lookup

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

44 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, carrier networks, and messaging apps, and clean the customer lists you already own.

Practical status signals

Return practical status fields such as registered/not registered, live active status, and a per-row verdict you can count and reconcile.

Cost-effective scale

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

API integration

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

“E.164 — The international public telecommunication numbering plan.” Every number ZelNum checks is normalized against the E.164 standard, which allows a maximum of 15 digits and underpins how carrier networks route calls worldwide.

Source: ITU-T Recommendation E.164, International Telecommunication Union.
Core products

WhatsApp, Telegram & Phone Checker Tools

Check WhatsApp and Telegram lists first, then enrich the same file with phone validation, carrier lookup, and account-signal screening 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
Network status

Carrier Lookup

Confirm a number resolves on its mobile network before SMS spend or CRM cleanup, right after the account checks.

Live status Resolvable Bulk counts
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, recovery, or platform-coverage signals.

ViberCheck if a phone number is registered with Viber 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 SignalCheck if a phone number is registered with Signal SnapchatCheck if a phone number is registered with Snapchat 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, 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.

What each check returns

A quick summary of the signals each core check adds to a record before you import or act on it:

Check Signals returned Best for
Phone validation Live status and a per-row verdict List hygiene and fraud filtering
Carrier lookup Whether the number resolves on its network SMS preparation and CRM cleanup
WhatsApp check Registered or not registered WhatsApp list cleaning before campaigns
Telegram check Account presence and online-status preview Contact list validation
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
HLR Lookup
$4
per 10K lookups
WhatsApp
$0.5
per 10K lookups
Telegram
$1.5
per 10K lookups
iMessage
$2.5
per 10K lookups
Bulk uploads and API access are available. Pay-as-you-go pricing, top-ups from $100 with up to 25% bonus credit.
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
List preparation

Check phone and messaging signals before a list import, 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 live network status, bulk uploads, and API validation inside marketing and risk workflows.

Read guide
Guide Carrier Lookup Guide for SMS Routing and CRM Hygiene Compare HLR, MNP, and carrier signals before you import a list. Comparison Best Phone Validators for Bulk List Cleaning Compare coverage, pricing, API depth, and batch workflow support. Playbook Best WhatsApp Checkers for List Data Quality Plan WhatsApp registration checks before high-volume list imports. 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, account-signal checks, and CSV list cleaning for data you are authorised to process.

  • Phone validation and carrier lookup
  • WhatsApp, Telegram, and other messaging app checks
  • Account-signal screening across social platforms
  • CSV/TXT list cleaning for bulk files
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

A ZelNum lookup returns a registration signal and nothing more. We do not message the numbers you check, and we do not open private messages, contact lists, or account content in WhatsApp, Telegram, or any other messaging or social account. Built for CRM list cleaning, marketing list hygiene, and fraud and risk review, not unsolicited outreach or spam. Use authorized data only, and hold a lawful basis and any consent required before a lookup.

Contact UsSupport email, what to include with a request, and typical response windows.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.Terms of ServicePermitted and prohibited uses, consent requirements, and the limits of the verification service.