CLX is a leading global provider of cloud-based communications and has served as Sinch's leading SMS partner over the past two years.
Secure your app with Flash Call Verification for Android. Flash Call technology intercepts a verification phone call, allowing you to verify numbers with a seamless user experience that removes pin-entry and reduces signup friction. Using the Sinch Verification SDK, you can integrate Flash Call verification into your existing apps with just a few lines of code.
Our in-house engineering team brings over 100 years of experience in VoIP and WebRTC and utilizes adaptive and automatic codec selection for optimal audio quality
Sinch connects 2B+ minutes and 250M+ verifications per year in crisp HD quality using tier-1 carriers and data-optimized routing
Easily add crisp HD quality VoIP calling using WiFi calling or PSTN origination and termination to your app.
Verify user phone numbers quickly and effectively using the Sinch SMS API, Voice, or Flash Call technology.
Add video calling to anywhere in the world over a data connection or WiFi from your website or app with the Sinch SDK.
Send SMS from your iOS and Android app, backend, or website
Sinch offers the most competitive and transparent pricing. No hidden fees. No commitments. Pay as you grow. Check out our pricing page for details.
LEARN MOREid callClient = [sinchClient callClient];
[callClient callUserWithId:@"John"];
CallClient callClient = sinchClient.getCallClient()
Call call = callClient.callUser("John");
var callClient = sinchClient.getCallClient();
var call = callClient.callUser('John');
Sinch SDKs and APIs enable mobile app developers to integrate real-time communications with smartphone or web applications and cloud based back-end services.
“Sinch has created a service that has been very helpful to our company. It’s easy to integrate, easy for our users, and provides great results.”
"From purchase to implementation to performance, we are confident we found the right partner in Sinch."
“Because of Sinch’s expertise in VoIP, we were able to go to market with in-app calling in record time.”
With app to phone calling, you enable your users to call mobile and landline phones in 200+ countries, capitalizing on growing data plans for unparalleled user acquisition. Anonymous calling connects your users while maintaining their privacy.
Verify user phone numbers quickly and effectively using the Sinch SMS API, Voice, or Flash Call technology. Sinch's phone verification service gives your app the security it needs so that you can focus on the user experience and stunning interface. Phone verification SDKs are available today and ready to be integrated in your Android, iOS and web applications.
Questions? We’d love to talk to you.
Transparent pricing 
No hidden fees 
No commitments 
Pay as you grow 
