How to Find B2B Prospect Phone Numbers (77%+ Find Rate With Waterfall Enrichment)

Most sales teams I talk to have the same problem: they’ve got email sequences dialed in, LinkedIn touches mapped out, and reply rates that still feel stuck.

The missing piece? A phone number.

Cold calling still works. But finding accurate, verified phone numbers for B2B prospects is harder than it should be. Most single-source tools return numbers for fewer than half your list, and you end up paying for data that never connects.

In this piece, I’ll show you exactly how to find verified prospect phone numbers in lemlist, where to slot cold calls into your sequences, and which alternative tools are worth considering if you’re shopping around.

Why you should include cold calling steps

Making at least 6 cold calls can increase your contact rates by 70%, according to ServiceBell.

That stat alone makes the case. But here’s the real reason I keep recommending cold calls to every team I work with: emails are easy to ignore. A phone call forces a real conversation.

The email saturation problem

Emails and LinkedIn messages have become the default in B2B outreach. And they work, we’re all for it, but they’re also easy to dodge. Prospects archive, snooze, or just never open.

Adding a cold calling step in your campaigns gives you the chance to actually lay out your value prop live. Your leads interact. They ask questions. You learn what they actually need, not what you assumed from a job title.

With cold calling, you get a better read on what your leads need, the help you can offer, and the tactics you’ll use to convert them into paying clients.

lemlist phone number finder

Now that we’ve covered why cold calling matters, let’s get to the tool itself.

The first thing you need for cold calls is phone numbers. And I know firsthand how painful it is to chase them across five different tools.

lemlist’s phone number finder solves this with waterfall enrichment: instead of querying one data source and hoping for the best, it checks 14+ phone data providers in sequence. The result is a 77%+ average find rate, well above the market average for single-source tools. You only pay for numbers that actually connect (roughly $20 per 100 verified numbers), so there’s no wasted spend on dead data.

lemlist is rated 4.6/5 on G2 with 1,300+ reviews, which puts it in the same tier as the dedicated data tools below, but with multichannel outreach built in.

You can find phone numbers using several different methods, even when your lead list is already built. The best part: you won’t need a third tool to manage phone numbers. They go directly into your lemlist lead lists and campaigns.

If you already have your lead list ready, access it, click on the Enhance leads option, and choose Find phone numbers.

lemlist handles the rest.

Now, if you want to include phone numbers when building your lists from scratch, lemlist offers a few different approaches.

lemlist Chrome extension

With the lemlist Chrome extension, you can scrape your leads’ data and push to your desired campaign directly from the same app, phone numbers included.

I’ve used this flow hundreds of times. Here’s the step-by-step:

1. 1.

   Install the extension

2. 2.

   Search for leads on LinkedIn

3. 3.

   On the search results page, click “Push lead(s) to lemlist”

4. 4.

   Check “Find phone”

5. 5.

   Select the campaign to push the leads to

6. 6.

   Hit “Push # leads to this campaign”

7. 7.

   The leads will appear in the campaign in lemlist, some with a phone number

Bear in mind that the data the Chrome extension can scrape from LinkedIn depends on what your leads have made public.

lemlist B2B lead database

The lead database works like a LinkedIn search, but with more filters and verified data baked in.

Choose from the available filters and narrow down your search to find your ICP. You’re pulling from a 600M+ lead database across 65M+ companies, not a single-source list.

Once you have your narrowed search, you’ll find a column for emails, immediately followed by the phone number column. Click on the lead and select the phone number option.

With this method, you won’t need a separate verifier. The data has already been verified for you.

CSV file

If you have your leads in a .csv file, you can also ask lemlist to find the phone numbers in the lead enrichment step.

Include cold calling in a campaign

Once you’ve used the phone number finder to track down your leads’ phone numbers, you need to put them to work.

With lemlist, you can include cold calling steps in your multichannel outreach campaigns.

• •

  Set up your Aircall or Ringover integrations on lemlist

• •

  Start a new campaign

• •

  Add a cold call task

• •

  Choose the senders who have Aircall activated

If you don’t already use Aircall or Ringover, lemlist’s native dialer lets you call 90+ countries and get AI call summaries without a separate telephony tool.

If you want more detailed instructions and a quick overview, watch this video!

With lemlist, you can integrate Aircall and Ringover and make your cold calls without leaving the app. You can also track all cold calling activity in the unified inbox.

Where should you include cold calls?

Take this template for example. Kevin included the cold calling step as the last step. This ensures you avoid wasting valuable seconds monologue-ing about yourself, which makes leads lose interest fast.

At this point, even if your leads haven’t read your emails closely, they’re familiar with your name. You can add a more conversational flow to the start of the call.

Make sure the subject line for all the previous emails is the same so you can easily reference it during the call and your lead can find the email sequence quickly to keep up with the conversation.

After all, your previous emails serve as a catalogue of your services.

With the lemlist template library, you don’t have to find the perfect formula yourself through painful trial and error.

Use the filters to find your ideal campaigns, edit, and launch.

If you need them, here are tips that will help with your cold calling strategy:

• •

  Don’t start by guilting your lead into staying on the phone. Avoid sentences like “Since you’re not responding to my emails, I’m calling.”

• •

  Make sure your tone is sympathetic and you’re tailoring your approach to your leads’ style.

• •

  Schedule your calls to fit their day. Avoid calling on Fridays, too early in the morning, or around lunch time. Aim for a mid-morning call.

• •

  Politely mention your previous emails. For example: “Perhaps you haven’t had time, but for more information, I sent you a link in an email on Tuesday about our business.”

• •

  Don’t monologue. Ask your lead questions and give them sufficient time to answer and participate actively in the conversation.

• •

  Stand up while talking to infuse energy and confidence into your cold calls.

• •

  Organize your call with bullet points to avoid getting flustered or confused.

• •

  Take notes of important things your leads mention throughout the call so you can reference them and adapt your strategy. This will make your leads feel heard and increase trust.

B2B phone number finders: other tools worth knowing

Before I go deeper into alternatives, a quick note on what’s actually ranking for “phone number finder” right now. If you Googled that term, you probably saw Whitepages, Truecaller, and NumLookup at the top. Those are consumer reverse-phone-lookup tools built for identifying unknown callers and spam numbers. Useful if someone’s calling you and you want to know who it is, but they’re a different tool for a different job.

What we’re covering here is the B2B use case: finding a prospect’s direct dial so you can cold call them. Different intent, different tools.

If you’re exploring options beyond lemlist, here are some solid alternatives I’ve evaluated.

However, if you need more, you can learn more about how to find phone numbers by name by looking at some other tools.

1. Lusha

Rating ⭐⭐⭐⭐

G2 – 4.3/5 (1,656+ reviews), Capterra – 4.0/5 (396 reviews)

Lusha is a finder that crowdsources contact information including phone numbers from social media profiles and business websites. Like lemlist, it also has a verifier to provide accurate information.

Pricing: Free tier, Starter at $49.90/month, Pro at $69.90/month, and Premium at $399.90/month on annual billing, with Scale as the custom enterprise option.

✅ Pros

• •

  Chrome extension

• •

  Free plan with limited searches

❌ Cons

• •

  Users report coverage gaps outside North America

• •

  Phone number reveals cost 5 credits each (vs. 1 for an email), so phone-heavy teams burn through credits fast

2. Datagma

Rating ⭐⭐⭐⭐⭐

G2 – 4.7/5 (5 reviews)

Datagma is a Chrome extension that allows you to get contact information online. You can extract phone numbers, emails, and social profiles into a Google Sheet by conducting searches on LinkedIn.

Pricing: Free plan (one user, one-time purchase), Discover plan at $39/user/month, Premium plan starting at $69/user/month, and custom plans for teams of five or more.

✅ Pros

• •

  Bulk uploads available

• •

  Contact change detection for up-to-date data

❌ Cons

• •

  Datagma queries a single database, so when it misses, you get nothing with no fallback to secondary providers

• •

  No bulk uploads on the free plan

3. UpLead

Rating ⭐⭐⭐⭐⭐

G2 – 4.7/5 (824 reviews)

UpLead is a B2B lead generation software that offers a 95% accuracy guarantee in data extraction. UpLead has 160–180M contacts plus a Chrome extension that allows you to extract your leads’ emails and phone numbers in bulk.

Pricing: 7-day free trial with 5 credits (no permanent free tier), Essentials at roughly $99/month for 170 credits, Plus at roughly $199/month for 400 credits, and a custom Professional tier for higher volume.

✅ Pros

• •

  Reverse phone number lookup available

• •

  Find personal and business phone numbers

❌ Cons

• •

  Lacks integrations

• •

  Draws from one 160M+ database, not a multi-provider waterfall

4. Free phone number finder

If you want to get one phone number for free, use this phone number finder free tool. Just enter a LinkedIn URL or your prospect’s name and domain, and it’ll find the number using lemlist’s phone number waterfall enrichment.

✅ Pros

• •

  Completely free

• •

  Can get a free number from a LinkedIn profile URL or from a name and domain

• •

  Uses lemlist waterfall enrichment

❌ Cons

• •

  Only works to find one phone number at a time

Over to you

Finding phone numbers used to mean bouncing between three or four tools, paying for data that didn’t connect, and manually importing CSVs into your outreach platform. That’s a lot of friction for a single channel.

lemlist’s phone finder consolidates that into one step: waterfall enrichment across 14+ providers, a 77%+ find rate, and verified numbers that drop straight into your multichannel sequences.

If you’ve been running email-only outreach and want to add cold calls without duct-taping together a new stack, this is the fastest way I know to get started.

Ready to stop guessing and start dialing verified numbers? Start your 14-day free trial.