Bulk phone validator · Real-time carrier lookup

Validate entire contact lists before you dial or text

Q: How often should I validate my contact list?

For optimal results, verify every phone number before sending an SMS text or making a call. If you're not frequently adding new numbers, a monthly verification should suffice.

Q: How much money can I save on undelivered messages and failed calls?

Clients typically experience immediate savings ranging from 5% to 15% of their monthly SMS and voice outreach costs.

Q: Why is your service better than others?

We conduct real-time carrier lookups for the latest results, avoiding outdated data. We also offer deactivated and suspended lookups at no extra cost. SubscriberVerify is designed to save you more money than its cost.

Q: How do I use CSV upload?

CSV upload is simple on the SubscriberVerify platform. Upload your data, follow the instructions, and our system will process it. You can receive only our output or append it to your data.

Q: Do you have API documentation?

Yes — see our API documentation at subscriberverify.com/documentation for request fields, examples, and bulk API reference. You can use both our API and CSV upload, with reports accessible from your dashboard.

Upload a CSV and run real-time carrier lookup on every US and Canada number. SubscriberVerify flags landlines, deactivated lines, ported carriers, and unreachable contacts—so your SMS campaigns and outbound dial programs only target numbers that can actually connect.

No special CSV formatting required
Deactivated & suspended lookups included
Typical savings of 5–15% on SMS and voice spend

campaign_list_50k.csv Processing

39,102 of 50,000 numbers validated

Number	Type	Carrier	Result
(713) 555-	Landline	AT&T	Remove
(312) 555-	Mobile	Verizon	Deactivated
(415) 555-	Mobile	T-Mobile	Dial / text

2,847 filtered out

412 deactivated

47,291 ready to dial/text

5–15% average reduction in SMS and voice outreach spend

Real-time carrier lookup—not stale database files

Any size CSV lists with flexible column headers

US & CA numbers supported in bulk and via API

The hidden cost of dirty lists

What a bulk phone validator catches before you dial or text

Most contact databases contain 5–15% numbers that will never connect. You still pay for every SMS segment and wasted dial attempt—unless you validate the full list first.

Landlines in SMS lists

Standard landlines cannot receive SMS—wasting per-segment fees. Line-type data also helps dialers separate mobile from voice-only endpoints.

Deactivated & suspended lines

Numbers disconnected by carriers still sit in CRMs for months. Real-time checks surface them before your next call or text campaign.

Ported numbers on wrong routes

Subscribers switch carriers constantly. Outdated carrier data means misrouted texts, failed dials, and higher connection failure rates.

VoIP & unreachable endpoints

Virtual numbers and invalid formats look valid on paper but fail at the carrier layer—burning budget on every retry and idle agent time.

Simple bulk workflow

From raw CSV to dial- and SMS-ready list

No reformatting spreadsheets or writing scripts. Upload your file, map the phone column once, and download enriched results with carrier intelligence on every row.

Upload any CSV
Use your existing headers—we detect the phone column and accept lists of any length.
Run real-time carrier lookup
Each number is checked live for line type, carrier name, port status, and SMS/voice reachability.
Filter or export enriched data
Download a mobile-only SMS list, a callable list with line types, or append carrier fields to your original file.

SubscriberVerify bulk CSV upload interface showing phone list validation progress

Bulk export preview

What your validated file looks like

Every row returns carrier and deliverability fields you can filter on—whether you are prepping a dialer upload, an SMS blast, or both from the same source file.

Number	Line Type	Carrier	Deliverable	Recommended Action
(713) 555-	Landline	AT&T	false	Not SMS-deliverable
(312) 555-	Mobile	Verizon	false	Deactivated — suppress
(801) 555-	Mobile	T-Mobile	true	Ported — route to new carrier
(415) 555-	Mobile	T-Mobile	true	Dial / text

Included in every bulk run

Real-time carrier lookup checks on every number

SubscriberVerify combines DIP carrier intelligence with deactivated-number detection—capabilities that other validators often charge extra for.

Mobile vs landline vs VoIP

Segment mobile, landline, and VoIP before importing into your dialer, predictive dialer, or SMS platform.
Live carrier name & ID

Route texts and voice traffic with current carrier assignment data for better connect rates.
Ported-number detection

See when a subscriber moved carriers and which network owns the number today.
Deactivated & suspended

Included at no extra cost—remove dead numbers that waste dial attempts and SMS fees.
SMS-enabled landlines

About 7% of landlines accept texts. We flag them so SMS teams do not miss reachable contacts—and voice teams still see true line type.
Time zone & geo data

Schedule calls and texts in the subscriber’s local window using area-code and IP-based location signals.

Export-ready fields

Key fields appended to your bulk output

Filter and segment in Excel, your dialer, SMS platform, or CRM—or pipe the same data through our REST API for automated list hygiene.

Deliverability

deliverable
action
reason
deactivationDate

Carrier intelligence

dipCarrier
dipCarrierType
dipPorted
dipOcn

Line type & routing

nanpType
dipMessagingEnabled
dipMessagingProvider
dipLrn

Location

geoState
geoCity
timezone
geoMetro

Full reference: API documentation · also available in your dashboard after signup.

Who validates in bulk

Teams that run bulk phone validation every week

SMS & outbound dial teams

Scrub purchased or aged lists before every text blast or calling campaign to cut waste and improve connect rates.

Contact centers & BPOs

Verify outbound dial and text lists nightly so agents only reach working endpoints—not disconnected or mislabeled numbers.

Lead generation platforms

Validate numbers at ingest via API so buyers never receive landlines disguised as mobile leads.

CRM & marketing ops

Schedule monthly bulk re-validation to keep subscriber data fresh as numbers port and deactivate.

Two ways to validate

CSV bulk upload or real-time API

CSV bulk phone validator

Best for pre-campaign list scrubbing and pre-dial hygiene—before numbers hit your dialer or SMS platform.

Upload from dashboard—no code required
Append results or export a cleaned file
Ideal for lists of 1,000 to millions of rows

REST API validation

Best for continuous hygiene at lead capture, in your dialer, CRM, or IVR—validate before numbers enter SMS or voice workflows.

Sub-second real-time carrier lookup per number
Same fields as bulk CSV output
Documented endpoints with dashboard access

Common questions

Bulk phone validator FAQ

Does the software also verify international phone numbers?

Our software can verify only US and Canada phone numbers.

How often should I validate my contact list?

How much money can I save on undelivered messages and failed calls?

Why is your service better than others?

How do I use CSV upload?

Do you have API documentation?

Stop paying to reach numbers that will never connect

Run your first bulk validation with 10,000 free lookups—or create an account with 100,000 lookups for $50. Real-time carrier lookup on every number for SMS and voice lists; deactivated checks included.