Append Phone Numbers to Your Contact List
Append Phone Numbers to Your Contact List: upload a CSV or connect your CRM, and Cleanlist AI checks each row against 25+ providers in sequence. Every new workspace opens on Pro for 14 days with 250 credits, 3 seats.
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
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How does Cleanlist AI append phone numbers to your contact list?
Cleanlist AI's phone number append service queries 25+ data providers in a waterfall sequence to find direct dial and mobile phone numbers for your existing contacts. No single provider covers every segment, region and company size well. One is best on enterprise office numbers, another on SMB mobiles, another on numbers that changed recently, so the waterfall asks them in turn. On our 500-lead benchmark it found a phone number for 85% of contacts. Cleanlist AI owns no contact database. Each number comes back with its line type (mobile, landline or VoIP), so reps can sort the list before they call.
Why this is hard to do by hand
Most outbound now runs on email and phone, and most lead lists arrive with email only. So reps research every row by hand (LinkedIn, the company site, free lookup tools) and often end up with a switchboard number that never reaches the buyer. The gap is widest at small companies, early-stage startups and in industries with high turnover, the segments any single provider covers worst.
What limits multi-channel outreach is usually an empty phone column
Email-only outbound is rarely a decision. Usually the list has an empty phone column, and the plan grew around the data. A phone append fixes that, and the problem is easy to miss because it never shows up in a sequence report: a channel you never tried produces no bad numbers, so nobody flags it. You can price the fix before you start. Cleanlist AI charges 10 credits per phone number, a miss costs nothing and format checks are free, so you pay for the numbers returned, whatever the list size. Every new workspace opens on Pro for 14 days with 250 credits and 3 seats, enough to append 25 numbers and see what comes back before you pick a plan.
What a lookup costs
Each lookup walks 25+ providers in cost order, and you're charged once for what comes back: 1 credit for a verified work email, 10 for a phone number, 11 for both. Validation is 0.5 and AI qualification is 5. A lookup that finds nothing is free, and the whole team pays from one wallet.
- 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
Upload your contacts
Upload a CSV or connect your CRM. The minimum is a name and a company (or email domain). A title and location help providers tell two people with the same name apart, which raises the match rate.
- 02
Choose the number types
Ask for office numbers, mobile numbers or both. You can also add carrier type (mobile, landline, VoIP) and line status (active or disconnected).
- 03
Let the waterfall work
Cleanlist AI starts with the most accurate provider for each segment. If it has no number, the next provider tries with different data, and so on until one returns a verified number or every source has been tried.
- 04
Check each number
Every number is checked for format, carrier type and line status. Disconnected and VoIP-only numbers (often not a direct line) get marked, so reps know which to call first.
- 05
Review the results
The summary shows how many matched, the match rate by segment and the carrier mix. Search costs 0 credits and format checks are free, so you spend 10 credits only on numbers that come back.
- 06
Download or sync back
Download the file with the numbers next to your original columns, or sync back to HubSpot or Salesforce, where they land in the standard or custom phone fields you choose.
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 |
|---|---|---|
| Providers queried per contact | One, whichever tool you bought | 25+ in a waterfall, stopping at the first deliverable result |
| Number types returned | Often switchboard or generic office | Office and mobile numbers first; 85% found on our 500-lead benchmark |
| Do Not Call Registry screening | Obtained from the FTC directly | Not provided. The FTC licenses Registry access itself |
| Carrier type identification | Not typically available | Mobile, landline, VoIP classification included |
| Appending 1,000 contacts | The same lookup repeated 1,000 times, by hand | One CSV upload processed as a single job |
| Price visibility | Rep time, unbudgeted | 10 credits per phone number, quoted before the run |
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 append 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 should a phone append cost, and what is the coverage spec?
Cleanlist AI charges 10 credits per phone number it finds, and a miss costs nothing. On our 500-lead benchmark it found a phone number for 85% of B2B contacts. Coverage is weakest on very small companies and in markets where fewer of the 25+ providers operate, which is why the waterfall asks several. New workspaces open on Pro for 14 days with 250 credits. After that the Free plan gives 50 credits a month, and paid plans are $49 a seat (750 credits) and $89 a seat (1,500) a month, 25% off on annual billing.
Does Cleanlist AI check the Do Not Call (DNC) registry?
No. Cleanlist AI does not screen appended numbers against the National Do Not Call Registry and returns no DNC status field. The FTC licenses Registry access directly to authorized sellers and telemarketers through telemarketing.donotcall.gov, so it is not something an enrichment vendor resells inside a data column. 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.
Can I append phone numbers to contacts that already have an email address?
Yes, and it's the most common case. Cleanlist AI uses the email, name and company you already have to find the matching number. The email helps most, because it pins down exactly which person you mean.
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.
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.