# CheckNumber.AI, free trial, POST /v1/tasks, RCS Checker: Phone validation API

> Check whether phone numbers support RCS messaging and return the detected operating system for each number: iOS or Android.

CheckNumber.AI's phone validation API on its Free trial plan. It costs $0.00 per 1,000 phones. It returns 1 of the 9 key fields we check: Number.
We rank 614 plans by price. [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), [Abstract API](https://datacircle.dev/validate-phone-apis/abstract-api/19-monthly-starter-5000-requests-month/llms.txt) and [Listar](https://datacircle.dev/validate-phone-apis/listar/top-up-from-10-starter-post-search-verify-whatsapp/llms.txt) are the best phone validation API providers in our benchmark.

- This page: https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-rcs-checker
- [Best phone validation API in 2026](https://datacircle.dev/best-phone-validation-api.txt)
- Get it: https://checknumber.ai/pricing
- Request: `POST https://api.checknumber.ai/v1/tasks`, RCS Checker
- API key: with the plan, on https://checknumber.ai/pricing
- Its API docs: https://docs.checknumber.ai/rcs-checker/
- Sold by: CheckNumber.AI (https://checknumber.ai)
- Checked: 2026-10-28

## In the answer

- Completeness: 11%
- Number: ✓

## Price

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

## Aggregators

- Aggregators: none

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Check whether phone numbers support RCS messaging and return the detected operating system for each number: iOS or Android.

## Data

- Countries: Worldwide
- What it checks: messaging apps
- Keep data: no limit
- Use data: "This license is granted solely for Your internal business purposes" (3.1), "You agree not to (a) license, sublicense, sell, resell, transfer, assign, distribute, or otherwise commercially exploit or make available to any third party the Service in any way, except as expressly permitted by these Terms or an Agreement, (b) modify or make derivative works based upon the Service, (c) reverse engineer, decompile, or disassemble the Service or attempt to gain unauthorized access to the Service or its related systems or networks, or (d) use the Service for any purpose or in any manner that is unlawful (including in violation of the PDPA) or prohibited by these Terms. Furthermore, You agree that any phone numbers or associated data obtained through the Service shall not be used by You or any third party acting on Your behalf to: (i) contact any individual without their prior, express, and informed consent for such contact, in accordance with PDPA requirements, (ii) send unsolicited commercial communications (spam), bulk messages, or any messages in violation of applicable anti-spam laws (including the Singapore Spam Control Act) and the PDPA, (iii) send harassing, abusive, threatening, defamatory, obscene, or otherwise unlawful communications, or (iv) engage in any other practices that violate the privacy or data protection rights of individuals or any applicable laws or regulations, including the PDPA" (3.2)

## Plan

- Pay: $0
- You get: 1,000 results
- Enough for: 1,000 results, once

## Rate limit

- Batch: 1,000,000

## Speed

- Answer: by polling

## The call

- You send: file, task_type "rcs"
- Method: POST
- Path: /v1/tasks

## About the plan

- Plan: Free trial
- Who can get it: anyone who contacts support

## The 3 fields the plan's answer can hold

phone number, activated, device operating system

## CheckNumber.AI's plans (3)

- [CheckNumber.AI, free trial, POST /v1/tasks, RCS Checker](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-rcs-checker/llms.txt): $0.00 per 1,000, 11% complete
- [CheckNumber.AI, top-up from $20, Pay as you go, POST /v1/tasks, RCS Checker](https://datacircle.dev/validate-phone-apis/checknumber-ai/top-up-from-20-pay-as-you-go-post-v1-tasks-rcs-checker/llms.txt): $0.15 per 1,000, 11% complete
- [CheckNumber.AI, contact us, Custom plan, POST /v1/tasks, RCS Checker](https://datacircle.dev/validate-phone-apis/checknumber-ai/contact-us-custom-plan-post-v1-tasks-rcs-checker/llms.txt): 11% complete

## CheckNumber.AI's calls for this API (27)

- `POST /v1/tasks`, Band Checker: [CheckNumber.AI, free trial, POST /v1/tasks, Band Checker](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-band-checker/llms.txt)
- `POST /v1/phone`: [CheckNumber.AI, free trial, POST /v1/phone](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-phone/llms.txt)
- `POST /v1/tasks`, iMessage Checker: [CheckNumber.AI, free trial, POST /v1/tasks, iMessage Checker](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-imessage-checker/llms.txt)
- `POST /v1/tasks`, Line Checker: [CheckNumber.AI, free trial, POST /v1/tasks, Line Checker](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-line-checker/llms.txt)
- `POST /v1/tasks`, Line Profile Checker: [CheckNumber.AI, free trial, POST /v1/tasks, Line Profile Checker](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-line-profile-checker/llms.txt)
- `POST /v1/tasks`, MAX Checker: [CheckNumber.AI, free trial, POST /v1/tasks, MAX Checker](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-max-checker/llms.txt)
- `POST /v1/tasks`, MAX Full Profile Checker: [CheckNumber.AI, free trial, POST /v1/tasks, MAX Full Profile Checker](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-max-full-profile-checker/llms.txt)
- `POST /v1/tasks`, Messenger Checker: [CheckNumber.AI, free trial, POST /v1/tasks, Messenger Checker](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-messenger-checker/llms.txt)
- `POST /v1/tasks`, Number Activity: [CheckNumber.AI, free trial, POST /v1/tasks, Number Activity](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-number-activity/llms.txt)
- `POST /v1/tasks`, Number Validation: [CheckNumber.AI, free trial, POST /v1/tasks, Number Validation](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-number-validation/llms.txt)
- `POST /v1/tasks`, Phone Carrier Bulk Lookup: [CheckNumber.AI, free trial, POST /v1/tasks, Phone Carrier Bulk Lookup](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-phone-carrier-bulk-lookup/llms.txt)
- `POST /v1/tasks`, RCS Checker: [CheckNumber.AI, free trial, POST /v1/tasks, RCS Checker](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-rcs-checker/llms.txt)
- `POST /v1/tasks`, Signal Checker: [CheckNumber.AI, free trial, POST /v1/tasks, Signal Checker](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-signal-checker/llms.txt)
- `POST /v1/tasks`, Telegram Age & Gender Checker: [CheckNumber.AI, free trial, POST /v1/tasks, Telegram Age & Gender Checker](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-telegram-age-gender-checker/llms.txt)
- `POST /v1/tasks`, Telegram Checker: [CheckNumber.AI, free trial, POST /v1/tasks, Telegram Checker](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-telegram-checker/llms.txt)
- `POST /v1/tasks`, Telegram Number Activity: [CheckNumber.AI, free trial, POST /v1/tasks, Telegram Number Activity](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-telegram-number-activity/llms.txt)
- `POST /v1/tasks`, US Carrier Advanced: [CheckNumber.AI, free trial, POST /v1/tasks, US Carrier Advanced](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-us-carrier-advanced/llms.txt)
- `POST /v1/tasks`, Viber Age & Gender Checker: [CheckNumber.AI, free trial, POST /v1/tasks, Viber Age & Gender Checker](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-viber-age-gender-checker/llms.txt)
- `POST /v1/tasks`, Viber Checker: [CheckNumber.AI, free trial, POST /v1/tasks, Viber Checker](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-viber-checker/llms.txt)
- `POST /v1/tasks`, Viber Number Activity: [CheckNumber.AI, free trial, POST /v1/tasks, Viber Number Activity](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-viber-number-activity/llms.txt)
- `POST /v1/tasks`, WhatsApp Advanced: [CheckNumber.AI, free trial, POST /v1/tasks, WhatsApp Advanced](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-whatsapp-advanced/llms.txt)
- `POST /v1/tasks`, WhatsApp Age & Gender Checker: [CheckNumber.AI, free trial, POST /v1/tasks, WhatsApp Age & Gender Checker](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-whatsapp-age-gender-checker/llms.txt)
- `POST /v1/tasks`, WhatsApp Checker: [CheckNumber.AI, free trial, POST /v1/tasks, WhatsApp Checker](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-whatsapp-checker/llms.txt)
- `POST /v1/tasks`, WhatsApp Number Activity: [CheckNumber.AI, free trial, POST /v1/tasks, WhatsApp Number Activity](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-whatsapp-number-activity/llms.txt)
- `POST /v1/tasks`, Zalo Age & Gender Checker: [CheckNumber.AI, free trial, POST /v1/tasks, Zalo Age & Gender Checker](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-zalo-age-gender-checker/llms.txt)
- `POST /v1/tasks`, Zalo Checker: [CheckNumber.AI, free trial, POST /v1/tasks, Zalo Checker](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-zalo-checker/llms.txt)
- `POST /v1/tasks`, Zalo Number Activity: [CheckNumber.AI, free trial, POST /v1/tasks, Zalo Number Activity](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-zalo-number-activity/llms.txt)

## CheckNumber.AI's APIs (2)

- [CheckNumber.AI: email verification API pricing, 3 plans](https://datacircle.dev/validate-email-apis/checknumber-ai/free/llms.txt)
- [CheckNumber.AI: phone validation API pricing, 3 plans, POST /v1/tasks, RCS Checker](https://datacircle.dev/validate-phone-apis/checknumber-ai/free-trial-post-v1-tasks-rcs-checker/llms.txt)

## CheckNumber.AI: phone validation API alternatives

- [Antideo, $10 monthly, 100 requests/hour, GET /phone/{country code}/{phone number}](https://datacircle.dev/validate-phone-apis/antideo/10-monthly-100-requests-hour-get-phone-country-code-phone-number/llms.txt): $0.139 per 1,000, 67% complete, live
- [APIFreaks, $500 yearly, Yearly 600,000 credits a month, POST /phone/validation](https://datacircle.dev/validate-phone-apis/apifreaks/500-yearly-yearly-600000-credits-a-month-post-phone-validation/llms.txt): $0.139 per 1,000, 67% complete, stored
- [ZelNum, $100 pack, Pay as you go, $100 top-up, POST /detect/file, X Phone Number Checker (file upload)](https://datacircle.dev/validate-phone-apis/zelnum/100-pack-pay-as-you-go-100-top-up-post-detect-file-x-phone-number-checker-file-upload/llms.txt): $0.143 per 1,000, 11% complete
- [Veriphone, $999 pack, 5,000,000 credits, GET /v3/verify, /v3/verify](https://datacircle.dev/validate-phone-apis/veriphone/999-pack-5000000-credits-get-v3-verify-v3-verify/llms.txt): $0.20 per 1,000, 78% complete, stored

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-10-28.

- https://checknumber.ai/llms.txt
- https://checknumber.ai/pricing
- https://checknumber.ai/terms
- https://docs.checknumber.ai
- https://docs.checknumber.ai/rcs-checker/