# TrustLookup, free: Phone validation API

> Find out whether a phone number is real before you send it a code. Get it back in E.164 format with its country, line type and time zone.

TrustLookup's Free plan for the phone validation API costs $0.00 per 1,000 phones. We check each provider's docs for 9 fields. TrustLookup's docs list 5: Formats, Validity, Type, Carrier, Place.
We haven't run TrustLookup through [our phone validation API benchmark](https://datacircle.dev/best-phone-validation-api.txt) yet.
This plan is free. We rank 1,342 plans for phone validation APIs by price. Half the plans cost $3.867 or less per 1,000 phones. [See the best free phone validation API plan.](https://datacircle.dev/best-phone-validation-api.txt)
[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/trustlookup/free
- [Phone validation API in 2026: the best of 60+ compared](https://datacircle.dev/best-phone-validation-api.txt)
- Get it: https://trustlookup.io?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Request: `GET https://api.trustlookup.io/v1/lookup`, Phone validation
- API key: with the plan, on https://trustlookup.io?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Its API docs: https://trustlookup.io/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing#lookup
- Sold by: TrustLookup (https://trustlookup.io?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing)
- Checked: 2026-11-10

## In the answer

- Completeness: 56%
- Formats: ✓
- Validity: ✓
- Type: ✓
- Carrier: ✓
- Place: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Repeat free: never
- Also pays for: from the same budget: Email validation · IP intelligence · WHOIS and domain age

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Find out whether a phone number is real before you send it a code. Get it back in E.164 format with its country, line type and time zone.

## Data

- Freshness: 30 days
- Countries: Worldwide
- What it checks: numbering plan
- Keep data: no API terms
- Use data: no API terms

## Plan

- Pay: $0
- You get: 250 credits a month
- Enough for: 250 calls a month
- Expires: month

## Rate limit

- Per second: 5
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: q. Optional: checks, fresh
- Method: GET
- Path: /v1/lookup

## About the plan

- Plan: Free
- Who can get it: anyone

## The 15 fields the plan's answer can hold

valid, E.164 format, international format, national format, country, country name, calling code, line type, original carrier, location, time zones, summary, risk score, cached, checked at

## TrustLookup's plans (4)

- [TrustLookup, free](https://datacircle.dev/validate-phone-apis/trustlookup/free/llms.txt): $0.00 per 1,000, 56% complete, 30 days
- [TrustLookup, $19 monthly, Starter, GET /v1/lookup, Phone validation](https://datacircle.dev/validate-phone-apis/trustlookup/19-monthly-starter-get-v1-lookup-phone-validation/llms.txt): $2.533 per 1,000, 67% complete, 30 days
- [TrustLookup, $79 monthly, Growth, GET /v1/lookup, Phone validation](https://datacircle.dev/validate-phone-apis/trustlookup/79-monthly-growth-get-v1-lookup-phone-validation/llms.txt): $2.257 per 1,000, 67% complete, 30 days
- [TrustLookup, $249 monthly, Scale, GET /v1/lookup, Phone validation](https://datacircle.dev/validate-phone-apis/trustlookup/249-monthly-scale-get-v1-lookup-phone-validation/llms.txt): $1.992 per 1,000, 67% complete, 30 days

## TrustLookup's calls for this API (2)

- `GET /v1/lookup`, Phone validation: [TrustLookup, free](https://datacircle.dev/validate-phone-apis/trustlookup/free/llms.txt)
- `GET /v1/lookup`, Phone validation, full: [TrustLookup, $19 monthly, Starter, GET /v1/lookup, Phone validation, full](https://datacircle.dev/validate-phone-apis/trustlookup/19-monthly-starter-get-v1-lookup-phone-validation-full/llms.txt)

## TrustLookup's APIs (6)

- [TrustLookup: company enrichment API pricing, 4 plans](https://datacircle.dev/company-enrichment-apis/trustlookup/free/llms.txt)
- [TrustLookup: domain WHOIS API pricing, 4 plans](https://datacircle.dev/domain-whois-apis/trustlookup/free/llms.txt)
- [TrustLookup: email verification API pricing, 4 plans](https://datacircle.dev/validate-email-apis/trustlookup/free/llms.txt)
- [TrustLookup: IP company lookup API pricing, 4 plans](https://datacircle.dev/ip-company-lookup-apis/trustlookup/free/llms.txt)
- [TrustLookup: people enrichment API pricing, 4 plans](https://datacircle.dev/person-enrichment-apis/trustlookup/free/llms.txt)
- [TrustLookup: phone validation API pricing, 4 plans](https://datacircle.dev/validate-phone-apis/trustlookup/free/llms.txt)

## TrustLookup: phone validation API alternatives

- [Phone List Cleaner, $499 pack, Pro Clean, POST /v1/lookup/bulk](https://datacircle.dev/validate-phone-apis/phone-list-cleaner/499-pack-pro-clean-post-v1-lookup-bulk/llms.txt): $1.996 per 1,000, 56% complete, 24 hours
- [Veriphone, $999 pack, 5,000,000 credits, GET /v3/verify, /v3/verify, full](https://datacircle.dev/validate-phone-apis/veriphone/999-pack-5000000-credits-get-v3-verify-v3-verify-full/llms.txt): $1.998 per 1,000, 78% complete, live
- [WaliChat, $99.90 monthly](https://datacircle.dev/validate-phone-apis/walichat/99-90-monthly/llms.txt): $1.998 per 1,000, 22% complete, live
- [1s2u, $1,000 pack](https://datacircle.dev/validate-phone-apis/1s2u/1000-pack/llms.txt): $2.00 per 1,000, 67% 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 2026-11-10.

- https://trustlookup.io?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://trustlookup.io/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://trustlookup.io/phone-number-lookup-api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://trustlookup.io/phone-validation-api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://trustlookup.io/privacy?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://trustlookup.io/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing