# sendSMS.ro, contact us: Phone validation API

> Want to optimize messages and save money? That’s what our HLR service does by identifying destinations where messages cannot be delivered.

sendSMS.ro's HLR Number Lookup plan lets you call the phone validation API. We check each provider's docs for 9 fields. sendSMS.ro's docs list 3: Validity, Carrier, Place.
We haven't run sendSMS.ro through [our phone validation API benchmark](https://datacircle.dev/best-phone-validation-api.txt) yet.
sendSMS.ro 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/sendsms-ro/contact-us
- [Phone validation API in 2026: the best of 60+ compared](https://datacircle.dev/best-phone-validation-api.txt)
- Get it: https://www.sendsms.ro/en/hlr-number-lookup/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Request: `GET https://api.sendsms.ro/json?action=hlr_perform_synchronous`
- API key: with the plan, on https://www.sendsms.ro/en/hlr-number-lookup/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Its API docs: https://www.sendsms.ro/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing#hlr-perform-synchronous
- Sold by: sendSMS.ro (https://www.sendsms.ro?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing)
- Checked: 2026-11-09

## In the answer

- Completeness: 33%
- Validity: ✓
- Carrier: ✓
- Place: ✓

## Price

- Billing: contact

## Aggregators

- Aggregators: none

## In their words

- Their pitch: Want to optimize messages and save money? That’s what our HLR service does by identifying destinations where messages cannot be delivered.

## Data

- Freshness: live
- What it checks: carrier, line in service
- Keep data: no API terms
- Use data: no API terms

## Rate limit

- Concurrent: 5
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: number
- Method: GET
- Path: /json?action=hlr_perform_synchronous

## About the plan

- Plan: HLR Number Lookup
- Who can get it: anyone with a sendSMS.ro account that has HLR enabled

## The 5 fields the plan's answer can hold

number status, MCC, MNC, country code, network name

## sendSMS.ro's plans (1)

- [sendSMS.ro, contact us](https://datacircle.dev/validate-phone-apis/sendsms-ro/contact-us/llms.txt): 33% complete, live

## sendSMS.ro's calls (1)

- `GET /json?action=hlr_perform_synchronous`: [sendSMS.ro, contact us](https://datacircle.dev/validate-phone-apis/sendsms-ro/contact-us/llms.txt)

## sendSMS.ro's APIs (1)

- [sendSMS.ro: phone validation API pricing, 1 plan](https://datacircle.dev/validate-phone-apis/sendsms-ro/contact-us/llms.txt)

## sendSMS.ro: phone validation API alternatives

- [Stream Telecom, contact us](https://datacircle.dev/validate-phone-apis/stream-telecom/contact-us/llms.txt): 33% complete, live
- [VertexSMS, contact us, High-volume senders and custom rate inquiries, POST /hlr](https://datacircle.dev/validate-phone-apis/vertexsms/contact-us-high-volume-senders-and-custom-rate-inquiries-post-hlr/llms.txt): 33% complete, live
- [Vonage, contact us, Specific pricing by country, POST /requests, Current Carrier insight](https://datacircle.dev/validate-phone-apis/vonage/contact-us/llms.txt): 33% complete, live
- [XConnect, contact us, Contact sales, Live Status](https://datacircle.dev/validate-phone-apis/xconnect/contact-us-contact-sales-live-status/llms.txt): 33% 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 2026-11-09.

- https://www.sendsms.ro/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://www.sendsms.ro/en/hlr-number-lookup/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://www.sendsms.ro/en/terms-and-conditions?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing