How to Enrich a CSV with Phone Numbers in 2026 (No API Required)
Step-by-step guide to adding verified mobile phone numbers to any B2B contact list. Upload a CSV, get phones back — no coding needed. Works with LinkedIn URLs, full names, or company data.
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Most B2B contact lists come out of the box with names, company names, LinkedIn URLs — and no phone numbers. Adding verified mobile phones used to mean either paying a per-seat tool for every rep or hiring a developer to hit an API.
In 2026, there’s a simpler path: upload your CSV, get phones back.
Here’s how to do it with Datagma’s file enrichment.
What You Need Before You Start
Your CSV should have at least one of:
- LinkedIn profile URL (best match rate — e.g.,
https://www.linkedin.com/in/john-doe) - Full name + company name (e.g., “John Doe” + “Acme Corp”)
- Full name + country (e.g., “John Doe” + “France”)
LinkedIn URL gives the highest match rate. Full name + company is a good fallback for contacts you don’t have URLs for.
Step 1: Sign Up for Datagma (Free)
Go to app.datagma.com/sign-up. No credit card required. The free plan includes 3 phone lookups/month — enough to test the quality before committing.
Step 2: Go to File Upload
From the dashboard, click File Upload (or go to /file-upload). This is Datagma’s batch enrichment feature — no API needed.
Step 3: Upload Your CSV
Upload your contact list CSV. Datagma supports standard CSV format with headers. Typical file structure:
first_name,last_name,linkedin_url,company
John,Doe,https://www.linkedin.com/in/john-doe,Acme Corp
Jane,Smith,https://www.linkedin.com/in/jane-smith,Beta IncStep 4: Map Your Columns
Datagma will ask you to map your CSV columns to the input fields it uses:
- LinkedIn URL → map to your
linkedin_urlcolumn - Full Name → map to
first_name+last_name(or a combined name column) - Company → map to your
companycolumn
If you have LinkedIn URLs, use them — they dramatically improve match rate.
Step 5: Select What to Enrich
Choose which data you want Datagma to add:
- ✅ Mobile phone number (direct mobile — no switchboards)
- ✅ Verified email address (optional — enrich both in one pass)
- ✅ WhatsApp detection (available on Popular+ plans)
Step 6: Download Your Enriched CSV
Datagma processes your file and returns a new CSV with the enriched columns added:
first_name,last_name,linkedin_url,company,phone,email
John,Doe,https://www.linkedin.com/in/john-doe,Acme Corp,+33612345678,john.doe@acme.com
Jane,Smith,https://www.linkedin.com/in/jane-smith,Beta Inc,+442071234567,jane.smith@betainc.comContacts where no phone was found are returned with an empty phone column — you’re not charged for misses.
Expected Results
Based on Clay’s Q4 2025 benchmark (Datagma ranked top 3 EMEA, top 2 APAC):
| Region | Expected phone match rate |
|---|---|
| UK | ~40–55% |
| France | ~40–55% |
| Germany | ~35–50% |
| US | ~30–45% |
| APAC | ~35–50% |
Match rates vary by industry and seniority. C-level and VP-level contacts tend to have higher match rates than entry-level.
Pricing
- Free: 3 phones/month — test quality before buying
- Regular ($49/mo): 100 phones/month
- Popular ($99/mo): 250 phones/month — most popular for weekly enrichment batches
- Expert ($249/mo): 750 phones/month
Phone credits start at $0.28/contact. All plans include 10 seats and email enrichment.
Alternative: Use the API for Automated Enrichment
If you want to automate enrichment — e.g., enrich every new lead in HubSpot, or run enrichment on a schedule — Datagma’s REST API can be integrated in:
- Clay (native integration)
- Make.com (HTTP module or native Datagma module)
- Zapier (HTTP action)
- n8n (HTTP Request node)
Get started → — free plan, no credit card required.