# GBG, contact us: Phone validation API

> Verify and risk-assess phone numbers in GBG Go using identity matching, fraud indicators such as SIM swap and call forwarding, and country-specific mobile checks.

GBG's Contact sales plan lets you call the phone validation API. We check each provider's docs for 9 fields. GBG's docs list 3: Number, Validity, Porting and roaming.
We haven't run GBG through [our phone validation API benchmark](https://datacircle.dev/best-phone-validation-api.txt) yet.
GBG gives this plan's price on request. We rank 1,342 plans for phone validation APIs by price. Half the plans cost $3.867 or less per 1,000 phones.
[GuGuData's CNY 124 (about $19) monthly plan](https://datacircle.dev/validate-phone-apis/gugudata/cny-124-monthly/llms.txt) is the cheapest paid plan per 1,000 phones. GuGuData's CNY 124 (about $19) monthly plan charges nothing per call. You get as many phones as GuGuData's rate limit allows. [Keyronne's pay-as-you-go plan](https://datacircle.dev/validate-phone-apis/keyronne/pay-as-you-go/llms.txt) costs the least for 10,000 phones a month: $0.20.
[Trestle](https://datacircle.dev/validate-phone-apis/trestle/top-up-from-10-self-serve-pay-as-you-go-get-3-0-phone-intel-phone-validation-api/llms.txt), [Signal House](https://datacircle.dev/validate-phone-apis/signal-house/top-up-from-10/llms.txt) and [Data247](https://datacircle.dev/validate-phone-apis/data247/12-pack-membership-get-v3-0-verify247-phone/llms.txt) are the best phone validation API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-phone-apis/gbg/contact-us
- [Phone validation API in 2026: the best of 60+ compared](https://datacircle.dev/best-phone-validation-api.txt)
- Get it: https://www.gbg.com/en/contact/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Request: `POST https://eu.platform.go.gbgplc.com/v2/captain/journey/start`
- API key: with the plan, on https://www.gbg.com/en/contact/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Its API docs: https://docs.go.gbgplc.com/docs/go-v2/api-reference/endpoint/start-journey?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Sold by: GBG (https://www.gbg.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing)
- Checked: 2026-11-10

## In the answer

- Completeness: 33%
- Number: ✓
- Validity: ✓
- Porting and roaming: ✓

## Price

- Billing: contact

## Aggregators

- Aggregators: none

## In their words

- Their pitch: Verify and risk-assess phone numbers in GBG Go using identity matching, fraud indicators such as SIM swap and call forwarding, and country-specific mobile checks.

## Data

- Countries: United States
- Keep data: no limit
- Use data: The Customer shall use the Service only for the Customer Use Case selected and specified in the Order Form.

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: resourceId, context.config.delivery "api", context.config.inlineResult true, context.subject.identity.phones[].type, context.subject.identity.phones[].number. Optional: context.config.syncWaitSeconds, context.subject.identity.firstName, context.subject.identity.lastNames, context.subject.identity.dateOfBirth, context.subject.identity.emails[].type, context.subject.identity.emails[].email, context.subject.identity.currentAddress.lines, context.subject.identity.currentAddress.locality, context.subject.identity.currentAddress.dependentLocality, context.subject.identity.currentAddress.postalCode, context.subject.identity.currentAddress.country
- Method: POST
- Path: /journey/start

## About the plan

- Plan: Contact sales
- Who can get it: GBG Go customers, who create their API client in the Account management portal

## The 10 fields the plan's answer can hold

outcome, account verification result, account status, account type, device change event, number change event, ported change event, SIM swap change event, status change event, mobile ID age alert

## GBG's plans (1)

- [GBG, contact us](https://datacircle.dev/validate-phone-apis/gbg/contact-us/llms.txt): 33% complete

## GBG's calls for this API (1)

- `POST /journey/start`: [GBG, contact us](https://datacircle.dev/validate-phone-apis/gbg/contact-us/llms.txt)

## GBG's APIs (4)

- [GBG: business verification API pricing, 1 plan](https://datacircle.dev/business-verification-apis/gbg/contact-us/llms.txt)
- [GBG: email verification API pricing, 1 plan](https://datacircle.dev/validate-email-apis/gbg/contact-us/llms.txt)
- [GBG: people search API pricing, 1 plan](https://datacircle.dev/people-search-apis/gbg/contact-us/llms.txt)
- [GBG: phone validation API pricing, 1 plan](https://datacircle.dev/validate-phone-apis/gbg/contact-us/llms.txt)

## GBG: phone validation API alternatives

- [Trestle, contact us, Enterprise, GET /2.0/real_contact, Real Contact API](https://datacircle.dev/validate-phone-apis/trestle/contact-us-enterprise-get-2-0-real-contact-real-contact-api/llms.txt): 33% complete, stored
- [TPSClear, contact us, 1,000,000+ washes](https://datacircle.dev/validate-phone-apis/tpsclear/contact-us-1000000-washes/llms.txt): 33% complete
- [Databar, contact us](https://datacircle.dev/validate-phone-apis/databar/contact-us/llms.txt): 33% complete, stored
- [GuGuData, contact us, Pay per call, GET /sms/mobileattribution](https://datacircle.dev/validate-phone-apis/gugudata/contact-us-pay-per-call-get-sms-mobileattribution/llms.txt): 33% complete

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-10.

- https://docs.go.gbgplc.com/docs/go-v2/api-reference/endpoint/start-journey?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://docs.go.gbgplc.com/docs/go-v2/api-reference/overview?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://docs.go.gbgplc.com/docs/go-v2/platform/modules/digital-identities-insights/phone-insights?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://docs.go.gbgplc.com/docs/go-v2/tutorials/run-journeys-synchronously?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://www.gbg.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://www.gbg.com/en/contact/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://www.gbgplc.com/legal-and-regulatory/agreement-for-gbg-services/investigate-api-service-schedule?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing