# SMS.to, free trial, POST /api/v2/lookup, Instant Single Number HLR Lookup: Phone validation API

> HLR lookup gives you live status and the home network profile. Good for reachability and basic routing.

SMS.to's phone validation API on its Free trial plan. It costs $0.00 per 1,000 phones. It returns 7 of the 9 key fields we check: Number, Formats, Validity, Type, Carrier, Porting and roaming, Place.
We haven't run SMS.to through [our phone validation API benchmark](https://datacircle.dev/best-phone-validation-api.txt) yet.
This plan is free. We rank 888 plans for phone validation APIs by price. Half the plans cost $3.376 per 1,000 phones or less.
[Botoi's $199 monthly plan](https://datacircle.dev/validate-phone-apis/botoi/199-monthly/llms.txt) is the cheapest paid plan per 1,000 phones: as little as $0.0066. Botoi's $199 monthly plan covers up to 1,000,000 phones a day.
[Data247](https://datacircle.dev/validate-phone-apis/data247/12-pack-membership-get-v3-0-verify247-phone/llms.txt), [Foxentry](https://datacircle.dev/validate-phone-apis/foxentry/top-up-pay-as-you-go-post-phone-validate-validate-phone-number-extended/llms.txt) and [HLR Lookups](https://datacircle.dev/validate-phone-apis/hlr-lookups/top-up-1-1m-post-hlr-lookup/llms.txt) are the best phone validation API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-phone-apis/sms-to/free-trial-post-api-v2-lookup-instant-single-number-hlr-lookup
- [Phone validation API: 40+ providers compared](https://datacircle.dev/best-phone-validation-api.txt)
- Get it: https://sms.to/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Request: `POST https://hlr.sms.to/api/v2/lookup`, Instant Single Number HLR Lookup
- API key: with the plan, on https://sms.to/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Its API docs: https://developers.sms.to/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing#b9181932-ab28-42d1-9873-57a17f3655f8
- Sold by: SMS.to (https://sms.to?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing)
- Checked: 2026-11-04

## In the answer

- Completeness: 78%
- Number: ✓
- Formats: ✓
- Validity: ✓
- Type: ✓
- Carrier: ✓
- Porting and roaming: ✓
- Place: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: HLR lookup gives you live status and the home network profile. Good for reachability and basic routing.

## Data

- Freshness: live
- What it checks: carrier, line in service
- Keep data: no limit
- Use data: You will at all times keep confidential all information acquired as a consequence of using Our Services, except for information already in the public domain or information which You are required to disclose by law, requested by any Regulator or reasonably required by your professional advisors for the performance of their professional services. [...] You warrant that You will not: Use the Services or permit the Services to be used to send Chargeable Events to any end-user for marketing purposes without that end-user’s explicit request for, or prior consent, to receiving them. If you are sending any Chargeable Event for commercial purposes to any of your end-users, You must abide by the telephone marketing practices of the end-users’ jurisdiction, including but not limited to, obtaining prior express written consent from those end-users, and give all end-users the right to opt out of receiving any further Chargeable Events sent by You for commercial purposes (and You shall promptly process any end-user’s election to opt out), Use the Services or permit the Services to be used to convey Chargeable Events to any end-user, with a frequency and in numbers which are excessive in Our reasonable opinion, Use the Services or permit the Services to be used for any improper, fraudulent, immoral or unlawful purpose, Use the Services or permit the Services to be used for the transmission of any material which is of a defamatory, offensive, abusive, obscene or menacing character or nature, Use the Services or permit the Services to be used in a manner that infringes the intellectual property rights or any other proprietary rights of any third party, or Use the Services or permit the Services to be used in a manner that may injure or damage any person or property or cause the quality of the Services to be impaired. In addition, you must not use the Services to: send unsolicited bulk messages (“spam”) or messages to recipients who have not validly opted-in, engage in phishing, smishing, fraud, or any deceptive or misleading practice, send messages promoting illegal goods or services, impersonate any person, company or institution without lawful authorisation, bypass or attempt to bypass carrier filters, blocks or anti-spam systems, artificially inflate traffic or generate messages solely to trigger callbacks, replies or billing events, use SIM farms, grey routes or other unauthorised routing methods.

## Plan

- Pay: $0

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: number, Accept header "application/json", Content-Type header "application/json". Optional: default_prefix
- Method: POST
- Path: /api/v2/lookup

## About the plan

- Plan: Free trial
- Who can get it: anyone of legal age to form a binding contract

## The 21 fields the plan's answer can hold

phone number, formatted number, line status, country code, mobile country code, carrier name, mobile network code, IMSI, ported, ported carrier name, ported mobile network code, roaming, roaming country code, roaming network, line type, report ID, lookup type, cost, currency, created at, updated at

## SMS.to's plans (2)

- [SMS.to, free trial, POST /api/v2/lookup, Instant Single Number HLR Lookup](https://datacircle.dev/validate-phone-apis/sms-to/free-trial-post-api-v2-lookup-instant-single-number-hlr-lookup/llms.txt): $0.00 per 1,000, 78% complete, live
- [SMS.to, contact us, Contact sales, POST /api/v2/lookup, Instant Single Number HLR Lookup](https://datacircle.dev/validate-phone-apis/sms-to/contact-us-contact-sales-post-api-v2-lookup-instant-single-number-hlr-lookup/llms.txt): 78% complete, live

## SMS.to's calls (2)

- `POST /api/v2/lookup`, Instant Single Number HLR Lookup: [SMS.to, free trial, POST /api/v2/lookup, Instant Single Number HLR Lookup](https://datacircle.dev/validate-phone-apis/sms-to/free-trial-post-api-v2-lookup-instant-single-number-hlr-lookup/llms.txt)
- `POST /api/v2/lookup`, Instant Single Number MNP Lookup: [SMS.to, free trial, POST /api/v2/lookup, Instant Single Number MNP Lookup](https://datacircle.dev/validate-phone-apis/sms-to/free-trial-post-api-v2-lookup-instant-single-number-mnp-lookup/llms.txt)

## SMS.to's APIs (1)

- [SMS.to: phone validation API pricing, 2 plans, POST /api/v2/lookup, Instant Single Number HLR Lookup](https://datacircle.dev/validate-phone-apis/sms-to/free-trial-post-api-v2-lookup-instant-single-number-hlr-lookup/llms.txt)

## SMS.to: phone validation API alternatives

- [Foxentry, free trial, POST /phone/validate, Validate phone number (extended)](https://datacircle.dev/validate-phone-apis/foxentry/free-trial-post-phone-validate-validate-phone-number-extended/llms.txt): $0.00 per 1,000, 56% complete, live
- [HLR Lookups, free, 100 free lookups, POST /hlr-lookups](https://datacircle.dev/validate-phone-apis/hlr-lookups/free-100-free-lookups-post-hlr-lookups/llms.txt): $0.00 per 1,000, 56% complete, live
- [seven.io, free test credit, GET /api/lookup/hlr](https://datacircle.dev/validate-phone-apis/seven-io/free-test-credit-get-api-lookup-hlr/llms.txt): $0.00 per 1,000, 78% complete, live
- [HLR Lookup, free, 200 free credits, POST /batches/{id}/sourcejson, Bulk uploads via API](https://datacircle.dev/validate-phone-apis/hlr-lookup/free-200-free-credits-post-batches-id-sourcejson/llms.txt): $0.00 per 1,000, 89% 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://developers.sms.to/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://sms.to?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://sms.to/acceptable-use-policy-and-agreement/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://sms.to/hlr-lookup-api/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://sms.to/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing