Infos B4BInfos B4B
Service

Phone Appending

Add verified direct-dial and mobile numbers to your contact records. Live-tested against carrier databases with TCPA compliance screening and 90%+ connection rates.

Append office, mobile, and direct-dial numbers — verified and TCPA-compliant for outbound programs.

Cold email alone isn't enough anymore. Average reply rates have dropped below 2% across most industries, and inbox placement is harder than ever. The teams that consistently hit quota combine email with direct-dial phone outreach — but most CRMs have phone data for fewer than 30% of their contacts. Phone appending fills that gap by matching your existing contacts with verified, live-tested direct-dial and mobile numbers, opening a second channel that gets 3-5x the response rate of email alone.

Capabilities included

  • Mobile-verified
  • TCPA-aligned
  • Direct-dial coverage
Why it matters

Why phone appending matters

Poor data quality silently undermines every campaign, forecast, and decision your revenue team makes.

Email open rates are declining industry-wide. Adding verified direct-dial phone numbers to your contact records opens a second outbound channel that many competitors ignore. Phone outreach generates 3-5x higher response rates than cold email alone, especially for enterprise and mid-market selling where deals require human conversation.

Revenue impact

Bad data costs B2B companies 15-25% of revenue through wasted effort and missed opportunities.

Reputation risk

High bounce rates damage sender reputation, pushing future campaigns into spam folders permanently.

Wasted SDR hours

Reps spend up to 30% of their time researching, cleaning, and correcting contact data manually.

Compliance exposure

Outdated suppression lists and missing opt-outs create regulatory liability under GDPR and CAN-SPAM.

Pipeline accuracy

Inaccurate contact data skews pipeline forecasts and leads to missed quota targets quarter after quarter.

CRM bloat

Duplicate and stale records inflate your CRM seat costs and make reporting unreliable across every team.

Key features

Key features of our phone appending

Every capability listed below is included as standard — no add-on fees, no tiered access.

/01

Direct-dial, mobile, and corporate number appending

Included in every phone appending engagement with no additional configuration required.

/02

Live-line testing and carrier verification

Included in every phone appending engagement with no additional configuration required.

/03

TCPA compliance screening and DNC cross-referencing

Included in every phone appending engagement with no additional configuration required.

/04

Number-type tagging (direct, mobile, switchboard)

Included in every phone appending engagement with no additional configuration required.

/05

International coverage across 15+ countries

Included in every phone appending engagement with no additional configuration required.

/06

90%+ connection rate on verified direct-dial numbers

Included in every phone appending engagement with no additional configuration required.

Who benefits

Who can benefit?

Our phone appending service is built for teams that take data quality seriously.

Whether you're a two-person SDR team or an enterprise RevOps organization managing millions of records, our service scales to your needs and integrates with your existing tools.

3,000+Active teams
32Industries served
01

SDR teams running multi-channel outbound sequences

02

Enterprise sales teams targeting named accounts

03

Recruiters needing direct access to hiring managers

04

Teams using parallel dialers or power-dialing software

05

Companies expanding outreach beyond email-only campaigns

By the numbers

Results you can measure

These are real metrics from active client engagements — not projections or industry averages. We publish what we can prove.

35-55%
/01 · Direct-dial match rate

We prioritize direct-dial office lines over switchboard numbers for higher connect rates.

90%+
/02 · Connection rate on verified numbers

Live-line testing confirms every number is active, not a fax, voicemail-only, or disconnected line.

3-5x
/03 · Higher response vs. email-only

Phone outreach cuts through inbox noise and generates real-time conversations with decision-makers.

Real-world applications

How teams use phone appending

Three common scenarios where this service drives measurable results.

/01

Multi-channel sequence enhancement

Add phone steps to your Outreach or Salesloft sequences. We append verified direct-dial numbers so your SDRs can call on day 3 of a sequence instead of waiting for an email reply that may never come.

/02

Enterprise account penetration

Targeting Fortune 500 accounts? We provide direct-dial numbers for specific decision-makers so your reps bypass the switchboard and reach the right person on the first call.

/03

Recruiting outreach acceleration

Hiring managers don't respond to InMail. We append verified mobile and direct-dial numbers so your recruiters can reach candidates and hiring managers directly.

Delivery process

How we deliver phone appending

A straightforward, repeatable process from brief to delivery.

Every engagement follows our proven four-step workflow. Your dedicated data strategist manages the process end-to-end, keeping you informed at each stage and ensuring the final deliverable meets your specifications.

Our guarantees

  • Dedicated strategist assigned to your project
  • Free replacement for any record that bounces within 30 days
  • Delivery in CSV, XLSX, or direct CRM push
  • No long-term contracts — cancel anytime
01

Submit your contact list

Provide your records with name, company, and title fields. The more data points you include, the higher your match rate will be.

02

Multi-source matching

Our engine cross-references your contacts against verified phone databases spanning 15+ countries, prioritizing direct-dial lines over switchboard numbers.

03

Live-line verification

Every matched number is live-tested to confirm it is active, carrier-verified, and not a fax line or voicemail-only number. DNC registry screening is applied automatically.

04

Tagged number delivery

Receive your appended numbers within 48-72 hours, each tagged by type (direct-dial, mobile, switchboard) and ready for import into your dialer or sequencer.

Security & compliance

Your data is protected

Enterprise-grade security at every stage of the data lifecycle — from ingestion through processing to delivery and deletion.

SOC 2 infrastructure

All data is processed in SOC 2-compliant environments with end-to-end TLS encryption in transit and AES-256 at rest.

GDPR & CAN-SPAM

Every engagement includes compliance documentation. We exclude non-compliant records and honor suppression requests within 24 hours.

NDA & DPA on request

We sign non-disclosure and data processing agreements before any data transfer. Your records are never shared with third parties.

30-day data deletion

All client data is permanently deleted from our systems within 30 days of project completion. Expedited deletion is available on request.

Industries we serve

Trusted across 32 verticals

Our phone appending service is used by revenue teams in every major B2B vertical. Here are the industries we serve most frequently.

01
Healthcare & Life Sciences
02
Technology & SaaS
03
Financial Services
04
Manufacturing & Industrial
05
Professional Services
06
Education & EdTech
07
Real Estate & Construction
08
Telecommunications

Plus 24 additional verticals including energy, logistics, government, hospitality, and more. Contact us for industry-specific samples.

How it works

Four steps. Seventy-two hours.

Every phone appending engagement runs through the same disciplined pipeline — from the first conversation to a synced, verified list in your sequencer.

/01

Brief

A strategist scopes your ideal-customer profile, fields, geography, and the timeline you're working against.

/02

Curate

We pull from our 86M-record graph and route every match through a four-stage human + machine verification.

/03

Enrich

Missing fields are filled — emails validated, phones live-tested, titles confirmed against LinkedIn signals.

/04

Iterate

We sync the cleaned set into your CRM or sequencer, then refine each future run from your campaign signals.

What to expect

Outcomes you can measure.

These are the medians across our active book of business — grounded in real campaigns, not pitch-deck projections.

95%
/01 · Inbox placement

Average across 12 months of active client campaigns — measured, not estimated.

0%
/02 · Hard bounce risk

Every email is multi-source verified and re-checked at delivery. No bounce-fee surprises.

72h
/03 · Brief to first sample

From the first conversation to a usable, qualified test list — faster than any in-house build.

180+
/04 · Active client teams

Revenue, marketing, and RevOps teams across SaaS, healthcare, and financial services trust us.

FAQ

Phone Appending FAQ

Common questions about our phone appending service. Don't see yours? Email a strategist directly.

Ask a strategist

Compliance guaranteed

GDPR, CAN-SPAM, and CCPA compliant across every engagement.

72-hour turnaround

From initial brief to first sample delivery — every time.

95% deliverability

Backed by our replacement guarantee — no bounce-fee surprises.

What types of phone numbers can you append?

We append direct-dial office lines, mobile numbers, and corporate switchboard numbers. Each number is tagged by type so you can filter by channel preference in your outreach campaigns.

How do you verify phone numbers are current?

Every number goes through live-line testing — we check that the number is active, identify the carrier, and confirm it's not a fax line, voicemail-only, or disconnected number.

Are your phone records TCPA compliant?

Yes. We cross-reference against the National Do-Not-Call Registry and maintain internal suppression lists. Mobile numbers are flagged for TCPA consent requirements, and we include compliance documentation with every delivery.

What's the typical match rate for phone appending?

Direct-dial match rates typically range from 35-55%, and mobile match rates from 25-40%. We prioritize verified numbers over volume — every appended number is live-tested before delivery.

Can you append international phone numbers?

Yes. We cover 15+ countries across North America, Europe, and APAC. International numbers follow local format standards and are verified against regional carrier databases.

How is phone appending priced?

Pricing is per verified number delivered, not per record submitted. You only pay for numbers that pass live-line testing. Volume discounts apply at 10,000+ records, and we offer subscription pricing for ongoing appending needs.

Can I request a sample batch before placing a full order?

Absolutely. We provide a free sample of up to 500 records so you can evaluate match rates, number quality, and connection rates before committing to a larger project.

What is your refund policy if numbers don't connect?

We guarantee 90%+ connection rates on verified direct-dial numbers. Any number that is confirmed disconnected within 30 days of delivery is replaced at no charge or credited toward your next order.

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