Flash Call Verification
Replace manual OTP entry with flash call verification that confirms users through short missed calls and caller ID detection.
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Trusted by Leading Brands Worldwide
$130B
is the expected valuation for the flash call market by 2026
60%
of costs can be reduced by using flash calls instead of SMS
5B
flash calls were successfully conducted in 2022
What Are Flash Calls?
Flash calls are an authentication method used to verify a user's identity through a missed or short automated phone call. When a user signs in or creates an account, the system places a call to their phone from a unique number. The app or website can automatically recognize the incoming number.
Flash Call API IntegrationMade Simple and Scalable
Initiate the Flash Call
Trigger a flash call by sending an API request with the user’s phone number, verification session details, and any required configuration parameters. The API starts the missed-call verification flow and assigns the caller ID digits.
Detect the Caller ID
Use an Android call detection SDK or app-side logic to read the incoming caller ID automatically where supported. The app captures the last 4-6 digits without requiring the user to type a code manually.
Receive Delivery and Status Updates
Configure webhooks to receive delivery confirmation, call status updates, and verification events in real time. These callbacks help your system track whether the flash call was placed, detected, or failed.
Handle the Verification Result
Send the detected caller ID digits back for validation or process the verification result callback returned by the API. Once the result is confirmed, your application can approve the login, signup, or transaction flow.
Transparent and Flexible Pricing
| Country | Price |
|---|---|
 United States | From $0.01836 |
 Brazil | From $0.00561 |
 Italy | From $0.01166 |
 Germany | From $0.011 |
 Japan | From $0.0121 |
Trending Use Cases for Business Texting
Account Login
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.
2F Authentication
Take your security up a notch by using flash calling authentication as a second factor. Users enter their password via a flash call instead of SMS authentication to ensure security.
Transaction Authorization
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.
Identity Verification
Opt for a secure and efficient identity verification solution with flash calls or Verified SMS, especially in the healthcare and finance sectors so users can securely access sensitive info.
Password Reset
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.
Integrate flash call verification into your application using APIs, automatic caller ID detection, webhook callbacks, and mobile authentication workflows designed for scalable user verification.
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Got Questions? We’ve Got Answers
What is an A2P flash call?
An A2P flash call is a type of automated phone call service that is initiated by a business or organization as part of their application-to-person messaging strategy. A2P flash calls are often used in industries such as finance, healthcare, and eCommerce, where security is of the utmost importance.
How does flash call verification work?
When a user attempts to log in to an application or website that uses flash calls, they will receive an automated phone call with a verification code. The user then enters the code into the application or website to verify their identity.
Are flash calls good for the user experience?
Yes, flash calls can be good for user experience as they provide a quick and user-friendly authentication method. Since they only require a user to answer an automated call and enter a verification code, it can be a more seamless authentication process compared to traditional password-based authentication methods.
What devices are compatible with flash calls?
Flash calls are compatible with all mobile devices with an iOS or Android operating system. With Android, the code is processed automatically. However, with iOS or the web, users must input the code manually.
Are flash calls cost-effective?
Yes, flash calls are quite affordable. According to studies, using flash calls can result in about 60% cost reduction compared to using SMS for authentication purposes. This is due to the fact that flash calls use VoIP technology, which allows for the transmission of voice and data over the internet, eliminating the need for traditional telephone networks and associated charges.
What happens when I get a missed flash call?
If you receive a missed voice call, it means that the authentication process was not completed successfully. To verify your identity, you will need to initiate the process again and receive a new flash call with a unique code to enter.
Are flash calls more secure than SMS?
Flash calls and SMS OTP each offer different security advantages. Flash calls reduce reliance on visible text messages and can lower some phishing or interception risks, while SMS OTP remains one of the most trusted and widely adopted authentication methods globally. Many businesses combine multiple channels together for stronger authentication resilience and delivery reliability.
What is the difference between flash calls and OTP?
OTP (one-time password) is the authentication code itself, while flash call is one delivery method used to verify a user’s identity. Instead of sending a visible code through SMS or email, flash call verification uses an incoming phone number or caller ID pattern tied to the verification session. The user or application then confirms the digits to complete authentication.
Do flash calls work on iPhone?
Yes, flash calls can work on iPhone devices, though the experience differs from Android. Due to iOS platform restrictions, apps typically cannot automatically detect incoming caller ID digits in the background the same way Android apps can. In most iPhone verification flows, users manually enter the last digits of the incoming call to complete 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.
