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Verificación por Flash Call
Replace manual OTP entry with flash call verification that confirms users through short missed calls and caller ID detection.
Premios y reconocimientos recientes
Con la Confianza de Marcas Líderes a Nivel Mundial
$130B
es la valoración prevista para el mercado de Flash Call en 2026
60%
de los costes pueden reducirse utilizando llamadas Flash en lugar de SMS
5B
llamadas Flash completadas con éxito en 2022
¿Qué son las llamadas Flash?
Flash calls are a phone verification method where a short incoming call is placed to the user’s phone number and automatically disconnected before the call is answered. Instead of receiving a traditional SMS OTP, the last 4-6 digits of the incoming caller ID act as the one-time verification code tied to that authentication session.
In supported mobile applications, the app can automatically read the incoming caller ID in the background, allowing verification to complete without the user manually viewing or entering a code. This creates a faster authentication flow while reducing friction compared to traditional SMS OTP verification.
Solución de autenticación inmediata y fiable
Fácilmente accesible a través de llamadas telefónicas normales u otros canales de voz
Elimina la necesidad de introducir datos manualmente o de utilizar dispositivos físicos
¿Cómo funciona la verificación con Flash Call?
Flash call verification starts when a user enters their phone number in an app or website and requests verification. The application sends the request to Dexatel’s Verify API, which immediately places a short automated call to the user’s device. The call disconnects automatically within seconds, usually before the user answers.
The incoming caller ID contains a unique sequence of digits linked to that verification session. On Android devices, the app can automatically detect and read the incoming number in the background for a frictionless experience. On iOS and web environments, users typically enter the last digits of the missed call manually.
Once the digits are captured, the application sends them back to the Dexatel API for validation. The Verify API matches the incoming caller ID against the verification request and confirms whether the authentication attempt is valid. If flash calls are unavailable or unsupported by the carrier, the verification flow can automatically fall back to SMS, WhatsApp OTP, Viber OTP, or other configured channels.
Flash Call API Integration
Initiate the Flash Call
Detect the Caller ID
Receive Delivery and Status Updates
Handle the Verification Result
Trending Use Cases of Flash Call Verification
App Onboarding
Verify new users quickly during app onboarding using flash call authentication flows. Flash calls help reduce friction during sign-up by allowing automatic phone number verification without manual OTP entry.
Account Recovery
Secure account recovery workflows by verifying that users still have access to their registered phone numbers. Flash call verification can help streamline password reset and account restoration processes.
Device Change and Re-Verification
Re-verify users automatically when they log in from a new device or reinstall an application. Flash call verification helps confirm device ownership while reducing onboarding friction for returning users.
Flash Call vs Other Channels
| Factor | Flash Call | Código OTP por SMS | Voice OTP | Contraseña de un solo uso por correo electrónico |
|---|---|---|---|---|
| Cost | Flash calls can be cost-efficient in many regions because verification happens through a short missed call rather than a text message. | SMS OTP pricing is predictable and globally standardized, making it a reliable option for businesses operating across multiple regions. | Voice OTP is typically more expensive because it relies on active voice call delivery and text-to-speech infrastructure. | Email OTP is often the lowest-cost option because it does not rely on telecom infrastructure or carrier delivery. |
| Speed | Verification is usually completed within seconds, especially when the app can automatically detect the incoming number. | SMS OTP delivery is generally fast, though delivery speed can vary depending on carrier routing and local telecom conditions. | Voice OTP may take slightly longer because users must answer the call and listen to the spoken code. | Email OTP speed depends on inbox delivery, spam filtering, and email provider performance. |
| Security | Flash calls avoid displaying a visible OTP message and can reduce some phishing or interception risks. They are often used alongside fallback authentication channels. | SMS OTP is widely trusted and commonly used as part of multi-factor authentication strategies across industries. | Voice OTP adds an additional verification layer through direct call delivery and can work well in accessibility-focused environments. | Email OTP benefits from existing email account security layers such as MFA and login monitoring. |
| UX friction | Flash calls can offer a low-friction experience because users may not need to manually enter a code. | SMS OTP is familiar to most users and requires only basic code entry. | Voice OTP requires users to answer a call and manually enter the spoken code. | Email OTP often involves switching apps or tabs to retrieve the code from an inbox. |
| Device compatibility | Works best on smartphones and apps that support caller ID detection, though manual verification can also be used. | Compatible with nearly all mobile phones, including feature phones and smartphones. | Works across most mobile and landline devices with voice support. | Works on any device with email access and an internet connection. |
| Best use cases | Mobile onboarding, cost-sensitive verification flows, and high-volume authentication. | Universal authentication, global verification, and fallback delivery. | Accessibility-focused flows, regions with reliable voice connectivity, and telecom-heavy authentication environments. | Low-cost account verification, desktop workflows, and platforms where users are already email-centric. |
Flash Call vs Flash SMS
Flash calls and flash SMS are different technologies used for different purposes. Flash call verification is a voice-based authentication method where a short missed call is placed to a user’s phone number, and the caller ID digits act as the verification code.
Flash SMS is a Class 0 SMS message that appears directly on a device screen without being automatically stored in the SMS inbox. Flash SMS is typically used for urgent notifications or temporary alerts rather than phone number verification workflows.
Flash Call Security and Fraud Prevention
Flash call verification helps reduce friction during authentication while still adding an additional layer of account protection. Each verification request is tied to a unique caller ID pattern or phone number sequence, allowing the platform to confirm that the user has access to the registered device. Since the verification happens through telecom signaling rather than a visible text message, flash calls can also reduce OTP interception and phishing attempts.
At the same time, secure flash call infrastructure still requires strong fraud prevention controls. Rate limiting, request throttling, device fingerprinting, and session expiration help prevent abuse such as repeated verification attempts, bot activity, and artificial traffic generation. Monitoring unusual verification behavior across regions, carriers, and IP ranges can also help identify suspicious activity early.
You can use flash calls as part of a broader multi-channel authentication strategy rather than as a standalone security mechanism. In cases where flash calls are unavailable or unsupported, platforms can automatically fall back to SMS OTP, WhatsApp OTP, or voice verification to maintain both security and delivery reliability.
What Is a Voice Firewall?
A voice firewall is a telecom security system designed to detect, filter, and block fraudulent or suspicious voice traffic before it reaches users or business infrastructure. It helps mobile operators and communication platforms prevent threats such as robocalls, artificial traffic generation, spoofed caller IDs, Wangiri fraud, and unauthorized international routing.
Voice firewalls analyze signaling patterns, call behavior, traffic anomalies, and routing activity in real time to identify suspicious activity. In authentication environments like flash call verification, voice firewall protections can also help reduce abuse attempts, fake verification traffic, and carrier manipulation that may increase costs or disrupt legitimate verification flows.
Price per Flash Call Verification
| País | Precio |
|---|---|
Estados Unidos | From $0.01836 |
Brasil | From $0.00561 |
Italia | From $0.01166 |
Alemania | From $0.011 |
Japón | From $0.0121 |
Flash Calls Pricing Model
Flash call verification pricing uses a pay-per-verification model, with flash call verification cost determined by destination country, carrier routing, traffic volume, and fallback configuration. Per flash call pricing and flash calling rates may also vary depending on route quality, regional telecom requirements, and authentication volume tiers.
Compared to SMS OTP, flash calls can reduce per-verification costs in many regions, especially for high-volume mobile authentication workflows. Businesses sending large authentication volumes can often access lower flash calling rates through volume-based pricing agreements.
Casos de uso más habituales de la verificación mediante llamada instantánea
Inicio de sesión en la cuenta
Safeguard account login flows through flash call verification instead of traditional password-based access. Users receive a short missed call linked to a verification session rather than manually entering passwords or OTP codes.
Autenticación de dos factores
Sube la seguridad un nivel utilizando la autenticación con llamadas Flash como segundo factor. Los usuarios reciben su código a través de una llamada Flash en lugar de un SMS, lo que garantiza una mayor seguridad.
Autorización de transacciones
Confirm purchases, fund transfers, and other sensitive actions using flash call verification. Users receive a short missed call linked to the authorization request before the transaction is approved.
Verificación de identidad
Opta por una solución de verificación de identidad segura y eficiente con Flash Call o SMS verificados, especialmente útil en los sectores sanitario y financiero, donde los usuarios necesitan acceder de forma segura a información sensible.
Restablecimiento de contraseñas
Authenticate users during password reset flows using flash call authentication. Flash calls can help simplify account recovery while reducing manual code entry during the reset process.
App Onboarding
Verify new users quickly during app onboarding using flash call authentication flows. Flash calls help reduce friction during sign-up by allowing automatic phone number verification without manual OTP entry.
Account Recovery
Secure account recovery workflows by verifying that users still have access to their registered phone numbers. Flash call verification can help streamline password reset and account restoration processes.
Device Change and Re-Verification
Re-verify users automatically when they log in from a new device or reinstall an application. Flash call verification helps confirm device ownership while reducing onboarding friction for returning users.
Integrate flash call verification into your application using APIs, automatic caller ID detection, webhook callbacks, and mobile authentication workflows designed for scalable user verification.
Let’s Get in Touch
Build faster mobile authentication flows with flash call verification, automatic caller ID detection, and API-driven user verification. Talk to our team about integrating flash calls into your onboarding, login, and authentication systems.
Got Questions? We’ve Got Answers
What is an A2P flash call?
How does flash call verification work?
Are flash calls good for the user experience?
What devices are compatible with flash calls?
Are flash calls cost-effective?
What happens when I get a missed flash call?
Are flash calls more secure than SMS?
What is the difference between flash calls and OTP?
Do flash calls work on iPhone?
Cuenta con la confianza de equipos de comunicación de todo el mundo
Nos encanta poder automatizar y personalizar los mensajes. ¡Nos ha permitido ahorrar muchísimo tiempo y nos ha ayudado a mantener contentos a nuestros clientes.
Michal Rewienski
Director general de Toolla
Desde que utilizamos Dexatel, nuestros clientes responden mejor a nuestros mensajes SMS.
Viktorija Bergmane
Responsable de Innovación y Desarrollo de Proyectos en Coffee Address
Hemos aumentado nuestra tasa de verificación de usuarios gracias a las soluciones de SMS programables de Dexatel y a sus elevadas tasas de entrega de códigos OTP.
Roman Sirokov
Director de Tecnología de Dizconto
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