Find Phone Numbers for B2B Contacts
To find a phone number for a B2B contact, give Cleanlist AI a name and company domain, an email address, or a LinkedIn URL. Cleanlist AI runs a waterfall across 25+ data providers and returns mobile and office phone numbers with a line type on each. On our 500-lead benchmark it found a phone number for 85% of contacts. Cleanlist AI does not own a contact database. Each phone number costs 10 credits, a full contact record costs 11, and a miss costs nothing. Every new workspace opens on Pro for 14 days with 250 credits and 3 seats, the $0 Free plan is 50 credits a month after that, and paid plans start at $49 per seat a month.
The Cleanlist AI waterfall looking for a phone number. For Ines Delacroix it tries providers in order and stops at attempt 5, the first deliverable result, which costs 10 credits. For Ben Trask all 7 attempts miss, and the charge is 0 credits.
VP of Sales · Decagon10,000+ users, from founders to full sales teams
- Switched from
ZoomInfo - Case study
HackerOneSwitched from
Apollo- Switched from
Clay - Case study
Sumo LogicSwitched fromClay- Switched fromApollo
- Case study
- Switched fromZoomInfo
- Switched fromZoomInfo
G2
Chrome Web Store
AppSumo
Questions about finding B2B phone numbers
Last updated:
How do I find a phone number for a B2B contact?
Give Cleanlist AI an identifier and it searches for the number. Provide a name plus a company domain, an email address, or a LinkedIn profile URL, and Cleanlist AI runs a waterfall across 25+ data providers. Cleanlist AI does not own a contact database. It is an orchestration layer that queries providers in sequence and stops at the first deliverable result, which is why coverage is broader than any individual vendor. The goal is a number that rings the contact directly. On our 500-lead benchmark, Cleanlist AI found a phone number for 85% of B2B contacts. Each phone number costs 10 credits, and a full contact record with verified email, phone, and company data costs 11. Every new workspace opens on Pro for 14 days with 250 credits and 3 seats.
What is a direct phone number?
A direct phone number rings the person's own desk phone or mobile without passing through a switchboard, a receptionist, or an extension menu. The alternative is a main company line plus an extension, which requires navigating a phone tree before the call reaches anyone. Direct numbers matter to outbound teams because the number of steps between calling and speaking largely determines how many conversations fit into an hour. Cleanlist AI classifies every returned number by type so a list can be sorted before it reaches a dialer, and phone number coverage was 85% on our 500-lead benchmark. Mobile numbers carry different calling rules than desk lines in the United States, so that classification is a compliance input as well as a productivity one.
Where does Cleanlist AI get B2B phone numbers?
Cleanlist AI queries 25+ third party data providers in a waterfall and maintains no contact database of its own. The waterfall runs providers in sequence: Cleanlist AI asks the first for the number, and if it returns nothing or something unverified, Cleanlist AI asks the next, and so on until a deliverable result comes back or the list of providers runs out. No individual provider covers every segment, geography and company size equally well, so Cleanlist AI can return a number when a single vendor tool returns nothing. Cleanlist AI is an orchestration layer and makes no claim about database size.
How much does it cost to find a phone number?
Finding a phone number costs 10 credits per number at Cleanlist AI. A verified email costs 1 credit, and a full contact record combining verified email, phone, and company data costs 11. Searching for people costs 0 credits, so building and filtering a list before enriching it is free. Every new Cleanlist AI workspace opens on Pro for 14 days with 250 credits and 3 seats, and the $0 Free plan is 50 credits a month after that. Starter is $49 per seat a month with 750 credits per seat, Pro is $89 with 1,500, and annual billing takes 25% off. One Pro seat's 1,500 credits work out to 150 phone numbers a month. Prices confirmed on 29 September 2026.
Can I find phone numbers in bulk from a CSV?
Yes. Upload a CSV to Cleanlist AI containing any combination of name, company domain, email address, or LinkedIn URL, and Cleanlist AI processes the whole file as one job. Column mapping is automatic for common headers and adjustable when it is not. Cleanlist AI returns the original rows with phone columns appended, a line type on each number, and a status showing whether the waterfall found a verified result. Results export as CSV or, on Pro, sync to HubSpot or Salesforce. Bulk lookup is the part worth automating, because per contact research repeats the same work once per row. The 14-day Pro trial covers the first 250 credits (a card is required), paid plans start at $49 a seat a month, and each phone number found costs 10 credits.
What is the difference between finding a phone number and validating one?
Finding a phone number produces a number that was not in your records. Validating one checks a number you already hold. Cleanlist AI does both, and they consume different resources. Finding runs the waterfall across 25+ providers and costs 10 credits per number, because each provider query carries a cost. Validating checks a number you supply against its country's numbering plan, which is free, and optionally against carrier records, which is not. Most outbound lists need both in sequence: find the numbers that are missing, then validate the whole set including the numbers already sitting in the CRM, because those are usually the oldest records and the most likely to be stale.
Is it legal to cold call a business phone number in the United States?
Cold calling a business phone number in the United States is generally lawful for genuine business to business calls. The FTC's guidance Complying with the Telemarketing Sales Rule states that most phone calls between a telemarketer and a business are exempt from the TSR, and that the prohibition on calling numbers on the National Do Not Call Registry does not apply to business to business calls. The exemption is narrower than it first sounds. Calls inducing retail sales of nondurable office or cleaning supplies are covered by the rule, and calls soliciting an employee to buy something for personal use are not business to business at all. State law adds requirements on top of the federal rule. Cleanlist AI supplies research data for B2B sales and does not provide legal advice.
Do I need consent to call a mobile number?
The FCC's TCPA rule at 47 CFR 64.1200 prohibits calling a number assigned to a cellular telephone service with an automatic telephone dialing system or an artificial or prerecorded voice, unless the call is for an emergency purpose or the called party gave prior express consent. Where the call is telemarketing, the rule requires prior express written consent. A call placed by hand sits outside that specific prohibition, which is why many B2B teams call mobile numbers by hand. Because the rule keys on whether the number is wireless, Cleanlist AI labels line type on every number it returns, and that label is what lets a team route mobiles into a manual queue. This is not legal advice.
Can I use Cleanlist AI to look up a private individual's phone number?
No. Cleanlist AI is built for business to business sales research and returns work contact data for professionals in a business context. Cleanlist AI is not a people finder, does not perform reverse lookups on private consumers, and should not be used to locate individuals for personal reasons. The distinction carries legal weight as well as ethical weight. The FTC's business to business exemption from the Telemarketing Sales Rule applies to calls between a telemarketer and a business, and the same FTC guidance states that calls soliciting an individual employee to buy something for personal use are not business to business solicitations. When the intended call is to a person rather than to a company, the consumer rules apply in full.
Does Cleanlist AI check the Do Not Call registry on the numbers it finds?
No. Cleanlist AI does not check the National Do Not Call Registry and returns no DNC status on any number it finds. Registry access is granted by the FTC directly, through the seller and telemarketer subscription site at telemarketing.donotcall.gov, and only to organizations the FTC has authorized, so it is not something an enrichment vendor can resell inside a data field. The FTC's guidance Complying with the Telemarketing Sales Rule states that the prohibition on calling numbers on the Registry does not apply to business to business calls. Teams whose calling program falls outside that exemption should obtain Registry access from the FTC and run the screen themselves. Cleanlist AI does not provide legal advice.
Why do phone numbers go stale faster than email addresses?
Phone records decay through a mechanism email does not have: number portability. The FCC defines it at 47 CFR 52.21(m) as the ability of users of telecommunications services to retain, at the same location, existing telecommunications numbers when switching from one telecommunications carrier to another. The number therefore survives while the carrier and often the line type behind it change, so a stored record keeps a valid looking number attached to obsolete metadata. Job changes compound the problem, because a direct office number belongs to a desk at the company, and it stops reaching the person the day they leave while remaining a live and answerable number. Cleanlist AI re-runs the waterfall on demand, so you can refresh a list before the campaign goes out.
Primary sources
- FTC, Complying with the Telemarketing Sales Rule (business to business exemption, National Do Not Call Registry)
- FCC TCPA rules codified at 47 CFR 64.1200 (prior express written consent, calls to cellular numbers)
- FCC number portability rules, 47 CFR Part 52 Subpart C, definition at 52.21(m)
- FTC National Do Not Call Registry, subscription access for sellers and telemarketers
How does Cleanlist AI find phone numbers for B2B contacts?
Cleanlist AI finds verified direct dial and mobile phone numbers for B2B professionals. Give it a name and company (or an email address) and Cleanlist AI asks 25+ phone data providers in sequence for a direct line, a mobile number or a switchboard extension, stopping at the first deliverable result. Cleanlist AI owns no contact database. Every number comes back in E.164 with its line type labelled, and malformed numbers are stripped before they reach your call queue. On our 500-lead benchmark, Cleanlist AI found a phone number for 85% of contacts.
Why this is hard to do by hand
Cold calling still works in B2B, but it fails at the first step when the rep has no direct number. A switchboard puts a phone tree and a gatekeeper between the rep and the person, and most of those attempts end in voicemail. SDRs need direct office and mobile numbers, and the phone column is the one most likely to be empty or stale in a CRM. A direct office number belongs to a desk, so it stops reaching the person the day they leave.
What a switchboard number costs an outbound team
A direct phone number and a switchboard number look the same in a CRM column and behave very differently. A switchboard means a phone tree, then a gatekeeper, then usually a voicemail nobody returns. Each step is another place for the attempt to end, and each one eats rep time whether or not the call reaches anyone. A direct number skips all three. That's why bad phone data shows up in conversations per hour: a rep working a switchboard-heavy list can hit the activity target and have almost nothing to show for it. Line type matters for the same reason. Knowing a number is a mobile before the call tells you which queue it goes in, because the FCC's TCPA rule at 47 CFR 64.1200 treats autodialed and prerecorded calls to cellular numbers differently from calls to desk lines.
Find numbers for the whole list in one job
Upload a CSV of names, domains, emails or LinkedIn URLs. Cleanlist AI runs the waterfall on every row, appends mobile and office phone numbers with a line type on each, and exports to CSV or, on Pro, syncs to HubSpot or Salesforce. The trial gives you 14 days on Pro with 250 credits and 3 seats.
- Verified work emails25 leads searched23 × 123
- Phone numbersVerified before anyone calls18 × 10180
- Qualification agentFit score with reasons25 × 5125
- 25+Providers queried in cost order on a single lookup
- 98%Verified work emails on our 500-lead benchmark
- 85%Phone numbers found on that same benchmark
- 0Credits for a lookup that finds nothing
How it works.
- 01
Give Cleanlist AI the person
Enter a name and company, an email address or a LinkedIn URL. For a bulk lookup, upload a CSV with any mix of those. Cleanlist AI detects the columns itself.
- 02
Search 25+ providers in sequence
Cleanlist AI runs the contact through 25+ phone data providers, one after another. Each covers different ground (office lines, mobile numbers, extensions, particular regions), so the next provider picks up where the last one missed.
- 03
Label the number type
Each number is labelled Direct line (the desk phone), Mobile (personal or company-issued), Switchboard plus extension, or VoIP. SDRs can work the direct lines and mobiles first.
- 04
Format check before export
Cleanlist AI normalizes every number to E.164 and checks it against its country's numbering plan. Malformed numbers, wrong country codes and impossible lengths come out before the list reaches your dialer.
- 05
Line type labelling for compliance routing
Every number carries a line type, so mobiles can be routed into a separate queue. The FCC's TCPA rule at 47 CFR 64.1200(a)(1)(iii) restricts autodialed and prerecorded calls to numbers assigned to cellular service, which makes line type a compliance input. Cleanlist AI does not screen the National Do Not Call Registry; the FTC licenses Registry access directly to authorized sellers and telemarketers at telemarketing.donotcall.gov.
- 06
Export a list your dialer can take
Download the numbers next to your original contact data, ready to import into a dialer such as Salesloft, Outreach, Orum or PhoneBurner. Every number is in E.164, country code included.
What you get.
98% verified work emails
That's on our 500-lead benchmark. Cleanlist AI checks each email and flags catch-all and disposable addresses before you send.
25+ data providers
Cleanlist AI asks them one at a time and stops at the first deliverable result. When one provider has nothing, the next one gets its turn.
No code required
Upload a CSV or connect your CRM. If your engineers want it, the API is there from the Pro plan.
14-day Pro trial
250 credits and 3 seats on Pro for 14 days. You don't need a card or a sales call to start.
Manual process vs Cleanlist AI.
| Feature | Manual | Cleanlist AI |
|---|---|---|
| Phone number types returned | Switchboard number from company website | Direct office line, mobile, and extension |
| Coverage | Only what is publicly listed on a website | 85% phone numbers on our 500-lead benchmark |
| Finding numbers for 500 contacts | The same research 500 times, by hand | One CSV upload, run as a single job |
| Cost per number found | Rep time, unbudgeted | 10 credits per phone number, quoted before the run |
| Malformed and impossible numbers | Discovered only when the call fails | Stripped by a format check before export |
How accurate is Cleanlist AI's data?
Cleanlist AI returned 98% verified work emails and 85% phone numbers on our 500-lead benchmark, pulling from 25+ data providers. Each lookup stops at the first deliverable result, meaning a verified or likely-valid email.
What do I get when I sign up?
A 14-day Pro trial: 250 credits, 3 seats, and every Pro feature. After it, the Free plan gives you 50 credits a month. A verified work email costs 1 credit, a phone number 10, and a miss nothing.
What data providers does Cleanlist AI use?
Cleanlist AI runs a waterfall across 25+ B2B data providers. For each record it asks one, moves to the next when that one has no match, and stops at the first deliverable result.
Can I connect my CRM?
Yes. HubSpot and Salesforce sync both ways on the Pro and Enterprise plans, and Salesloft and Lemlist take a one-way push. You can also upload a CSV, or use the REST API from Pro.
How long does it take to find my data?
It depends on the size of the file and how far down the waterfall each row has to go. Cleanlist AI runs the whole CSV as one job, so you upload once and download or sync the results when it's done.
What is the difference between a direct phone number and a switchboard extension?
A direct phone number rings the person's desk or phone with no receptionist or phone tree in between. A switchboard extension means calling the main company number first, then entering the extension. The fewer steps between calling and speaking, the more conversations a rep fits into an hour.
Are mobile numbers included, and is it legal to cold call them?
Yes, Cleanlist AI returns mobile numbers when available and labels line type on every number. On legality: the FCC's TCPA rule at 47 CFR 64.1200(a)(1) prohibits calls to numbers assigned to cellular telephone service using an automatic telephone dialing system or an artificial or prerecorded voice, unless the call is for an emergency purpose or made with the prior express consent of the called party, and telemarketing calls require prior express written consent. A call placed by hand sits outside that specific prohibition, which is why many B2B teams call mobiles by hand. Cleanlist AI does not screen the National Do Not Call Registry and returns no DNC status. Consult your own counsel for your jurisdiction.
How fresh is the phone data Cleanlist AI returns?
As fresh as the day you run it. Cleanlist AI keeps no phone database of its own: each lookup asks 25+ third-party providers live and returns the first deliverable result. So re-run the waterfall on the part of the list you're about to call, and don't treat an old result as permanent. Numbers decay through porting and job changes, which leave a valid-looking number attached to someone who has moved on.
Describe the job once. An agent runs it every week.
Clu turns one sentence into an agent. It searches 1B+ profiles, finds verified emails and phone numbers across 25+ providers, adds the people to your sequence and posts each run to Slack.
Weekly ICP outbound
Built by Clu from: “Every week, find 500 new people who match my ICP, get their emails and phones, and add them to Series B outbound.”
- Searched 1B+ profiles for new ICP matches500 foundPeople Search
- Ran the waterfall across 25+ providers487 emails · 412 phonesWaterfall
- Verified every email and phoneSMTP + catch-allVerification
- Added them to Series B outbound500 peopleSequences
- Posted the run to #pipelineSlackAgents
Friday 4:52 PM15 replies · 5 calls booked
Everything in the 14-day Pro trial
- Clu and agentsDescribe the job in one sentence. Clu builds the agent, runs it on a schedule or a CRM trigger and posts every run to Slack.
- People and Company SearchFind your buyers in 1B+ profiles from one sentence. Searching costs 0 credits.
- Waterfall enrichmentAsk 25+ providers in order and stop at the first verified email or phone number. 98% verified work emails and 85% phone numbers on a 500-lead benchmark.
- Email verificationRun SMTP and catch-all checks on every address before it reaches a sequence, at half a credit an email.
- ICP scoringScore every lead 0 to 100 against your ICP, with the reasons written down. The Research and Qualification skills do the digging.
- SequencesSend email from your reps' own inboxes, with call tasks. A reply stops the sequence. Sending costs 0 credits.
- CRM syncTwo-way sync with HubSpot, Salesforce and Pipedrive. Push finished lists to Outreach, Salesloft and Lemlist.
- Chrome extensionGet a verified email and phone number in one click on LinkedIn, Sales Navigator, Salesforce and HubSpot.
- MCP and APIRun the same search and waterfall from Claude or ChatGPT with 36 MCP tools, or from your own code with the REST API.
Agents that run this job
- Enrich new CRM contactsFinds the missing email and phone number on new Salesforce or HubSpot contacts and writes them to the record.
- New hires at target accountsEvery morning, finds sales and marketing leaders who started at your target accounts in the last 90 days, with their emails and phone numbers.
- Weekly ICP leadsEvery Monday, finds new people who match your ICP, checks their work emails and posts the verified ones in Slack.
14 days of Pro, free: 250 credits, 3 seats, agents, Sequences and Clu in Slack. Then Free at 50 credits a month, or Starter at $49 and Pro at $89 a seat a month.
Hand the job to an agent.
Upload a CSV or connect HubSpot, Salesforce or Pipedrive, and run it on your own data today.
14 days of Pro, free.
Get 14 days of Pro, free.
250 credits and 3 seats. Sign up with your work email for 100 more.