B2B data enrichment APIs with mobile numbers
Jul 6 – Oct 25, 2026Updated Oct 25, 2026
Reviewed by Dimitry Apollonsky
Which brands AI mentions
Mentioned in
ChatGPTChatGPTGoogle AI ModeGoogle AI Mode
Widest split: People Data Labs, 83% on ChatGPT and 27% on Google AI Mode.
- #1CognismChatGPT 96%Google AI Mode 100%
- #2tiedApolloChatGPT 100%Google AI Mode 68%
- #2tiedZoomInfoChatGPT 83%Google AI Mode 82%
- #2tiedLushaChatGPT 96%Google AI Mode 50%
- #5tiedPeople Data LabsChatGPT 83%Google AI Mode 27%
Questions and answers
ChatGPTOct 25, 2026
Several established B2B data providers offer APIs that enrich company and contact records with decision-maker details, including mobile phone numbers. The key distinction is whether a vendor provides phone-verified mobile numbers, merely supplies phone data, or can verify a number asynchronously when you request it.
Best B2B enrichment APIs to evaluate
1. Cognism
(Strong for verified mobiles)
Offers an API for contact search and enrichment with phone-verified mobile numbers, direct dials, job titles, seniority, and company information. Its phone verification and regional compliance features make it a strong candidate for outbound sales teams.
API access: package-dependent; contact Cognism for eligibility.
Source: Cognism developer documentation.
2. Lusha
Offers contact and company enrichment APIs that return verified phone numbers, professional emails, job roles, seniority, and company firmographics. Suitable for enriching existing CRM records or discovering decision-makers by role and company.
API access: plan-dependent.
Source: Lusha API overview.
3. Apollo.io
Provides people search, contact enrichment, mobile-number retrieval, and waterfall enrichment through its API. Phone reveal can trigger asynchronous verification and delivery through a webhook, which is useful for automated lead-enrichment pipelines.
API access: account eligibility and credit requirements apply; mobile reveals can cost extra.
Source: Apollo API documentation.
4. Seamless.AI
Its API provides contact search, company search, enrichment, and job-change intelligence. The vendor advertises a large database of verified contacts and mobile numbers, making it worth evaluating for high-volume prospecting.
API access: sales-led; request details on verification methodology and commercial terms.
Source: Seamless.AI product documentation.
5. UpLead
A good candidate when verified contact data and transparent match-based billing matter. Its API supports person and company enrichment, prospect searches, and mobile direct dials. UpLead says customers aren't charged when it fails to find verified data for an enrichment lookup.
Source: UpLead.
6. ZoomInfo
Enterprise-oriented contact and company intelligence with stakeholder search, enrichment, and phone data. Particularly relevant for large-scale sales operations and account-based marketing.
API access: subscription and data entitlements apply; typically sales-led.
ZoomInfo ·
Source: ZoomInfo data API documentation.
7. LeadMagic
A developer-focused option with a dedicated mobile-finder endpoint for finding decision-maker direct dials, plus people search and email validation. Worth testing if you want a narrower API rather than a full sales-engagement platform.
Source: LeadMagic's API overview.
Quick comparison
Provider Verified mobile positioning Best fit Cognism Explicitly phone-verified Quality-focused B2B outbound Lusha Verified phone data CRM enrichment and prospecting Apollo Phone verification during reveal All-in-one sales workflows Seamless.AI Advertises verified mobile data High-volume prospecting UpLead Verified phone data and mobile direct dials Match-based enrichment ZoomInfo Verified contact and phone data Enterprise sales intelligence LeadMagic Dedicated mobile-finder API API-first enrichment These descriptions reflect vendor documentation and claims, not a common independent accuracy test. Actual mobile coverage and verification standards vary by country and job function.
My recommendation
I'd start with Cognism, Lusha, and UpLead if verified mobile numbers are the primary requirement. Add Apollo if you also need prospect discovery, CRM workflows, and waterfall enrichment; evaluate LeadMagic if you prefer a more API-centric service.
Before committing, ask each provider for:
- Verification definition: Does “verified” mean carrier/line validation, recent human confirmation, or a successful connection?
- Mobile match rate: What percentage of your actual target contacts receive a mobile number?
- Freshness: When was each number last checked, and are timestamps returned by the API?
- Coverage: How well does the provider cover your target countries, industries, and seniority levels?
- Economics: Cost per successfully returned mobile, including failed matches, credits, and minimum commitments.
- Compliance: Data provenance, permitted use, opt-outs, and applicable calling restrictions.
One important caveat: a phone-verified number is not necessarily guaranteed to remain current or belong to the intended decision-maker.
One question to narrow this down: Are you looking for an API to enrich your own existing contact list, or an API that can discover decision-makers from a company name/domain and return their mobile numbers? The best shortlist differs depending on which workflow you need.
Google AI ModeOct 25, 2026
Several B2B data providersoffer enrichment APIs designed to return direct-dial mobile phone numbers for decision-makers. Because single-vendor database coverage fluctuates depending on the geography and industry, many modern platforms utilize a waterfall enrichment approach (cascading through multiple underlying vendors) to maximize match rates and verification accuracy.According to product documentation and industry analysis, prominent providers include:
- FullEnrich : Operates as a managed multi-source waterfall API that queries over 20 underlying phone and contact databases. It returns mobile phone line status (active/inactive), line type, and an AI-driven ownership match confidence score, charging credits only when a valid number is found.
- Cognism : Known for its compliance-first approach (GDPR/CCPA) and its proprietary Diamond Data mobile verification process. Cognism provides real-time REST API endpoints to search, preview, and redeem verified mobile numbers and direct dials, though access is typically contract-based rather than self-serve.
- ZoomInfo API : Offers enterprise-grade contact and company data infrastructure. Its API allows programmatic search and record enrichment for direct-dial mobile numbers, firmographics, and organizational hierarchies based on your specific enterprise subscription tier.
- People Data Labs (PDL) : Focuses on large-scale identity resolution and developer-first data APIs. PDL provides synchronous and bulk enrichment endpoints that return linked phone and mobile fields accompanied by an identity-match score.
- Apollo.io API : Provides widespread B2B contact data and enrichment capabilities. While popular and budget-friendly for heavy prospecting pipelines, developers should review rate limits and mobile data freshness relative to enterprise-exclusive providers.
If you'd like to narrow this down, let me know:
- Your estimated monthly enrichment volume (number of records)
- Target geographic regions (North America vs. heavily regulated markets like EMEA)
- Whether you prefer a pay-as-you-go self-serve API or an enterprise contract
I can help recommend the best fit for your stack.
Sources cited in this answer7
- reddit.comWhere can I find a reliable API for enriching B2B contact information?
- leadmagic.ioData Enrichment Tool — B2B Contacts & Companies | LeadMagic
- oppora.ai8 Best B2B Phone Number APIs for Verified Mobile Numbers (2026)
- fullenrich.comAPI Enrichment: What It Is and How It Works - FullEnrich
- cognism.comData enrichment API to improve leads | Cognism
- 6sense.comBest B2B Data Enrichment Tools | 6sense
Google AI ModeOct 16, 2026
Finding verified mobile numbers for key decision-makers via an API requires balancing database depth, waterfall enrichment capability (combining multiple vendors to boost match rates), and compliance (GDPR/CCPA scrubbing).
Top B2B data enrichment APIs that specialize in or offer robust verified mobile numbers include:
- FullEnrich API — Best for Multi-Source & Real-Time Line Verification
- How it works: Uses an asynchronous Enrich API that waterfalls across multiple data providers and performs a multi-step verification process (checking line type, active status, and ownership match via telecom data).
- Standout feature: Only charges credits for valid mobile numbers (filters out landlines/dead numbers) and provides confidence scoring and connect-rate indicators.
- Cognism API — Best for Compliance-Focused & Global Mobile Data
- How it works: Offers real-time REST API search and enrichment endpoints returning mobile numbers, quality indicators, and Do-Not-Call (DNC) list scrubbing flags.
- Standout feature: Highly rigorous phone-verification processes (their "Diamond Data" method) and strict adherence to global privacy regulations. Ideal if you target UK/EU markets alongside North America.
- Apollo.io API — Best for Configurable Waterfall & Budget Flexibility
- How it works: Provides robust endpoint options to query contact profiles and enrich records using their massive native database combined with waterfall logic.
- Standout feature: Highly developer-friendly with flexible self-serve or mid-tier pricing, though bulk rate limits require careful asynchronous handling.
- ZoomInfo API — Best for Enterprise-Grade Org Depth
- How it works: Offers direct-dial and mobile endpoints backed by the market-leading enterprise database.
- Standout feature: Unmatched coverage of high-level corporate org charts, though it operates on strict enterprise contract pricing with substantial annual commitments.
To help narrow down the right API for your stack, could you share:
- Expected monthly volume (number of lookups/enrichments per month)
- Geographic focus (US-only vs. global/EMEA)
- Primary input data (do you have LinkedIn profile URLs, or just Name + Company + Domain?)
Sources cited in this answer7
- reddit.comWhere can I find a reliable API for enriching B2B contact information?
- oppora.ai8 Best B2B Phone Number APIs for Verified Mobile Numbers (2026)
- cognism.comBuy Phone Database: 7 Ways To Get Business Phone Numbers
- docs.fullenrich.comGetting Started & Concepts
- fullenrich.comAPI Enrichment: What It Is and How It Works - FullEnrich
- help.fullenrich.comHow We Verify Phone Numbers | FullEnrich Help Center
ChatGPTOct 16, 2026
If your primary requirement is an API that returns verified mobile phone numbers for B2B decision-makers—such as CEOs, CTOs, VPs, procurement leaders, and department heads—I’d start by evaluating Cognism and Apollo. Both support programmatic contact enrichment, but their approach to phone verification, data coverage, and pricing differs.
Best B2B mobile enrichment APIs to evaluate
1. Cognism
(Best first choice for verified mobiles)
Designed for B2B prospecting with business contact data, including phone-verified mobile numbers. Its API supports searching and enriching people, filtering by job title and seniority, and applying regional compliance rules.
- API: REST over HTTPS
- Authentication: API key / bearer token
- Best for: Sales teams that prioritize mobile data quality and compliance
- Trade-off: API access and data entitlements depend on your subscription.
2. Apollo.io
(Best for a straightforward enrichment workflow)
Apollo provides person matching, contact enrichment, and phone-number retrieval through its API. Mobile numbers are requested through an asynchronous enrichment flow, with results delivered via webhook or polling.
- API:
POST /api/v1/people/match - Bulk endpoint:
POST /api/v1/people/bulk_match, up to 10 people per request - Best for: Enriching existing prospect lists with names, employers, titles, emails, and phone numbers
- Trade-off: Phone retrieval can consume additional credits, and availability isn't guaranteed for every contact.
3. People Data Labs
A developer-oriented option for matching and enriching person records at scale. Its API supports person enrichment and search across a large people dataset.
- Best for: Custom data pipelines, SaaS applications, and large-scale enrichment
- Trade-off: Confirm mobile-number coverage, verification semantics, and licensing for your target countries before selecting it.
Which API should you choose?
Requirement Best starting point Phone-verified mobile numbers Cognism Enrich an existing list of prospects Apollo Build a custom enrichment pipeline People Data Labs Search for decision-makers by job title and seniority Cognism or Apollo What to test before committing
Don't rely on a vendor's overall contact accuracy claim. Run a pilot against 200–500 real target contacts and measure:
- Mobile coverage: Percentage of contacts with a mobile number returned.
- Verification quality: Whether the number was actually phone-verified, and when.
- Accuracy: Percentage of numbers that reach the intended person.
- Match accuracy: Whether the person still holds the specified role at the target company.
- Cost per usable mobile: Total API and data credits divided by successfully verified, relevant numbers.
- Compliance: Country-specific calling restrictions, consent requirements, suppression lists, and permitted use of personal contact data.
One important distinction: a verified email does not mean a verified mobile number. Ask the provider specifically how it verifies mobile numbers and whether verification status and timestamps are returned by the API.
Let me narrow this down
What matters most for your use case?
1. Expected monthly enrichment volume
Under 10,000 contacts
10,000–100,000 contacts
100,000+ contacts
2. Target market
United States
US and Europe
Global
3. How will you use the API?
Enrich existing contacts in a CRM or database
Discover new decision-makers at target companies
Both
4. Main priority
Highest mobile accuracy
Lowest cost per usable mobile
High coverage at scale
Developer-friendly API and simple integration
[Compare APIs for my use case]
- FullEnrich API — Best for Multi-Source & Real-Time Line Verification
Also asked as
- Can you list B2B data enrichment APIs that include direct mobile numbers for decision makers in their verified data?
