# RCS number checker: find out in bulk which contacts you can reach How the RCS check works on bulk number lists: outcomes returned, credit cost (2 per number), accepted file formats and mistakes to avoid. The RCS check tells you, number by number, whether the number is compatible with RCS messaging. It is the step that separates a raw list from a list worth spending messages, time and budget on. _Updated: 2026-01-05_ ## Key points - One outcome per row: present, not present, or undetermined when the channel gives no reliable signal. - Cost: 2 credits per number, minimum batch of 500 numbers, with an estimate shown before you confirm. - CSV or XLSX input (or paste numbers directly), CSV output downloadable from your check history. - The check reflects the technical status at that moment: it is not marketing consent and not a delivery guarantee. ## What the RCS check is The RCS check verifies whether a mobile number is associated with an account or reachability on RCS. It sends no message to the recipient and reads no content: it queries the channel technically and returns a short outcome for each number in your list. RCS depends on device and carrier, and coverage varies widely between countries and handset models, so checking up front is decisive. That is why the check belongs before a campaign, not after: knowing in advance where a contact is reachable avoids paying for sends that will never arrive. ## How it works on NumeroVero.Online Upload a CSV or XLSX with a column of numbers, or paste them in. The platform normalises everything to international E.164 format, drops duplicates and unreadable rows, then shows how many numbers will actually be checked and how many credits it costs. The job runs in the background: you can close the page and get an email when it finishes. Results stay in your history, downloadable as CSV, with a check ID you can reconcile against your CRM. ## How to read the outcomes Present means the number is reachable on RCS at the time of the check. Not present means the channel does not recognise that number. Undetermined means the channel returned nothing usable, which can happen on some number ranges or during temporary limits. Undetermined rows are never hidden: they appear in the CSV and in the job summary, so you can decide whether to retry them later or exclude them from the campaign. ## When it is worth running It suits teams evaluating a move from SMS to RCS who need to size how many contacts can receive rich messages. The classic case is cleaning a legacy database: lists collected over years contain disconnected numbers, duplicates and contacts that were never active on that channel. The second case is channel routing: when the same audience exists on several channels, the check lets you send each contact where they actually have an account, cutting failures and cost per delivered message. ## Mistakes to avoid Uploading numbers without an international prefix is the most common reason for discarded rows: always include the country code or set a default country for the list. The other mistake is treating the outcome as permission. The check only says a number looks active on a channel: the legal basis for contacting that person is still your responsibility, as is compliance with the channel's own policies. ## Combining RCS with number validation Number validation confirms the mobile line exists and is usable; the RCS check confirms presence on the channel. Together, the first removes dead rows and the second segments the live ones. The recommended order is: validate the whole list, then run the RCS check on valid numbers only. That way you never spend channel credits on lines that no longer exist. ## Frequently asked questions **Does the recipient get a message or a notification?** No. The RCS check sends no messages and triggers no visible notification: it only returns a technical reachability outcome. **How much does checking a list cost?** The RCS check costs 2 credits per number, with a minimum batch of 500 numbers. The estimate appears before you confirm, and credits are universal across every service on the platform. **How long does it take?** It depends on list size. Jobs run in the background with parallel requests; you get an email as soon as the check is complete and results are ready to download. **Are the outcomes permanent?** No. They reflect the status at the time of the check. A contact can enable or disable RCS later, so older lists should be re-checked before important campaigns. **Can I use the results to send promotional messages?** The result is a technical data point, not consent. You still need a valid legal basis and must follow the channel's rules and applicable regulations. ## Check your RCS list today Upload the file, see the credit cost and get a CSV with an outcome for every number. No technical integration needed to start. - Start a RCS check: https://numerovero.online/en/signup - Open the service page: https://numerovero.online/en/rcs-check ## More guides - [Phone number validation and HLR lookup: how to clean a database](https://numerovero.online/en/guides/phone-number-lookup-validation.md) - [WhatsApp number checker: find out in bulk which contacts you can reach](https://numerovero.online/en/guides/whatsapp-number-checker.md) - [Viber number checker: find out in bulk which contacts you can reach](https://numerovero.online/en/guides/viber-number-checker.md) - [iMessage number checker: find out in bulk which contacts you can reach](https://numerovero.online/en/guides/imessage-number-checker.md) - [Telegram number checker: find out in bulk which contacts you can reach](https://numerovero.online/en/guides/telegram-number-checker.md) > Results describe the technical status detected at the moment of the check. They are not marketing consent and do not guarantee message delivery. ## Links - HTML version: https://numerovero.online/en/guides/rcs-number-checker - Service page: https://numerovero.online/en/rcs-check - Machine-readable site overview: https://numerovero.online/llms.txt