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SMS Verification
Confirm a user's phone number by texting them a one-time code and checking it. Bremlio handles the code, delivery, expiry and attempt limits — you make two API calls.
SMS verification proves a person controls the mobile number they entered, which cuts fake signups and secures sensitive actions. Bremlio (Bremlio Ltd, UK) sends the code by SMS and verifies the user's input — see the OTP API for the full request/response reference.
Get your API key freeHow it works
- You call
/v1/otp/sendwith the user's UK number; Bremlio texts a code and returns averification_id. - The user enters the code; you call
/v1/otp/verifywith theverification_idand code. - Bremlio returns whether it matched — handling expiry, attempt limits and single use.
Bremlio is UK-focused today (SMS and OTP); it does not currently offer voice or WhatsApp channels.
Pricing
| Item | Cost |
|---|---|
| SMS to a UK mobile | 4.65p |
| Monthly fee / contract | None — pay as you go |
| Free credits on signup | 25 |
| Minimum top-up | £10 |
See full pricing.
Frequently asked questions
- How does SMS verification work?
- You send a one-time code to the user's phone by SMS, then verify the code they enter. Bremlio generates the code, delivers it, and enforces expiry and attempt limits.
- How much does SMS verification cost?
- Each code is one SMS at 4.65p to a UK mobile, pay as you go. 25 free credits on signup.
- What stops someone guessing the code?
- Codes expire and the number of verification attempts is capped; a code can't be reused once verified.
- Which numbers are supported?
- UK mobile numbers (+44), in national (07…) or E.164 (+44…) format.
Add SMS verification to your signup flow.
Get your API key free