# The Data Group, free: Phone finder API

> Append verified phone numbers to contact records so your team can improve customer profiles, support outreach workflows, and reduce incomplete records.

The Data Group's phone finder API on its Free test plan. It costs $0.00 per 1,000 phones. It returns 2 of the 11 key fields we check: Number, Line type.
We haven't run The Data Group through [our phone finder API benchmark](https://datacircle.dev/best-phone-finder-api.txt) yet.
This plan is free. We rank 694 plans for phone finder APIs by price. Half the plans cost $250.00 per 1,000 phones or less.
[QuickEnrich's $399 monthly plan](https://datacircle.dev/find-phone-apis/quickenrich/399-monthly/llms.txt) costs the least per 1,000 phones: as little as $0.0015. QuickEnrich's $399 monthly plan covers up to 259,200,000 phones a month at no extra cost.
[MillionPhones](https://datacircle.dev/find-phone-apis/millionphones/300-monthly-pro-40000-credits-mo-get-phone/llms.txt), [AI Ark](https://datacircle.dev/find-phone-apis/ai-ark/119-monthly-usage-based-plan-30000-credits-month-post-v1-people-mobile-phone-finder/llms.txt) and [Fiber AI](https://datacircle.dev/find-phone-apis/fiber-ai/top-up-from-3-pay-as-you-go-post-v1-contact-details-single/llms.txt) are the best phone finder API providers in our benchmark.

- This page: https://datacircle.dev/find-phone-apis/the-data-group/free
- [Phone finder API: 20+ providers compared on price and data](https://datacircle.dev/best-phone-finder-api.txt)
- Get it: https://thedatagroup.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-finder-api-pricing
- Request: `POST https://testapi.tdg1.io/v3/append/phone`
- API key: with the plan, on https://thedatagroup.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-finder-api-pricing
- Its API docs: https://thedatagroup.com/api/phone-append-api-documentation?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-finder-api-pricing
- Sold by: The Data Group (https://thedatagroup.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-finder-api-pricing)
- Checked: 2026-11-04

## In the answer

- Completeness: 18%
- Number: ✓
- Line type: ✓

## Price

- $ per 1,000 phones: $0.00
- Per: call
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Append verified phone numbers to contact records so your team can improve customer profiles, support outreach workflows, and reduce incomplete records.

## Data

- Freshness: 1 day
- Keep data: "All Data provided under this Agreement is only available for Licensee’s one-time use." [...] "Licensee shall not make or cause to make any copies of the Data for any reason." [...] On termination or expiration: "Licensee shall not retain any portion of the Data and shall discontinue all use of the Data and, within thirty (30) days, erase, purge, destroy and/or return to Data Group any and all Data"
- Use data: "Licensee agrees that it shall use the Data only for its own internal and lawful direct marketing purposes." [...] "Licensee shall not provide the Data, in whole or in part, nor shall it provide any subset of the Data, to any third party as a stand-alone product, file or database." [...] "Licensee is prohibited from reselling, sublicensing, or otherwise providing the Data to any third-party." [...] "Licensee shall not use any Data as a factor in determining a consumer’s credit qualifications for (a) credit or insurance used primarily for personal, family or household purposes, (b) employment purposes, or (c) other purposes set forth in Section 604 of the FCRA" [...] "Licensee shall not use the Data as part of an application that provides name or phone number lookups to companies providing live-operator directory assistance services."

## Plan

- Pay: $0
- You get: 100 requests
- Enough for: 100 calls

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: FName, LName, Address1, Zip
- Method: POST
- Path: /append/phone

## About the plan

- Plan: Free test
- Who can get it: anyone

## The 7 fields the plan's answer can hold

phone, phone type, first seen date, last seen date, carrier, phone verification value, trace ID

## The Data Group's plans (3)

- [The Data Group, free](https://datacircle.dev/find-phone-apis/the-data-group/free/llms.txt): $0.00 per 1,000, 18% complete, 1 day
- [The Data Group, contact us, Enterprise](https://datacircle.dev/find-phone-apis/the-data-group/contact-us-enterprise/llms.txt): 18% complete, 1 day
- [The Data Group, contact us, Pay per lookup](https://datacircle.dev/find-phone-apis/the-data-group/contact-us-pay-per-lookup/llms.txt): $20.00 per 1,000, 18% complete, 1 day

## The Data Group's calls for this API (1)

- `POST /append/phone`: [The Data Group, free](https://datacircle.dev/find-phone-apis/the-data-group/free/llms.txt)

## The Data Group's APIs (6)

- [The Data Group: email verification API pricing, 2 plans](https://datacircle.dev/validate-email-apis/the-data-group/free/llms.txt)
- [The Data Group: email finder API pricing, 3 plans](https://datacircle.dev/find-email-apis/the-data-group/free/llms.txt)
- [The Data Group: phone finder API pricing, 3 plans](https://datacircle.dev/find-phone-apis/the-data-group/free/llms.txt)
- [The Data Group: phone validation API pricing, 3 plans](https://datacircle.dev/validate-phone-apis/the-data-group/free/llms.txt)
- [The Data Group: reverse email lookup API pricing, 3 plans](https://datacircle.dev/reverse-email-lookup-apis/the-data-group/free/llms.txt)
- [The Data Group: people enrichment API pricing, 3 plans, POST /append/demographic](https://datacircle.dev/person-enrichment-apis/the-data-group/free-test-post-append-demographic/llms.txt)
- [The Data Group: people enrichment API pricing, 3 plans, POST /lookup/phone](https://datacircle.dev/person-enrichment-apis/the-data-group/free-test-post-lookup-phone/llms.txt)

## The Data Group: phone finder API alternatives

- [NeuralVerge, $1,000 monthly](https://datacircle.dev/find-phone-apis/neuralverge/1000-monthly/llms.txt): $10.00 per 1,000, 45% complete, live
- [BigDataCorp, pay as you go, 1 - 10.000](https://datacircle.dev/find-phone-apis/bigdatacorp/pay-as-you-go-1-10-000/llms.txt): $11.804 per 1,000, 36% complete, 1 day
- [Edges, $440 monthly](https://datacircle.dev/find-phone-apis/edges/440-monthly/llms.txt): $21.99 per 1,000, 27% complete, live
- [Fiber AI, $24,000 yearly, Enterprise, POST /v1/contact-details/lite](https://datacircle.dev/find-phone-apis/fiber-ai/24000-yearly-enterprise-post-v1-contact-details-lite/llms.txt): $26.667 per 1,000, 18% complete, live

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-04.

- https://thedatagroup.com/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-finder-api-pricing
- https://thedatagroup.com/api/phone-append-api-documentation?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-finder-api-pricing
- https://thedatagroup.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-finder-api-pricing
- https://thedatagroup.com/terms-condition?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-finder-api-pricing