Cognalys, Inc. provides a multi platform service which help application developers in verifying the mobile number in their applications. Cognalys "two factor authentication" uses missed call technology instead of the traditional SMS based OTP technology. In case of rates, cognalys is much cheaper than the SMS method and supports more than 195+ countries.
Cognalys API can be used in any platforms ( Android, IOS, Windows, Web and many more ) and developers are powered with a reporting API to return details or verified users, or user's tries. in addition to the reporting API cognalys is providing one real time reporting API which will push the verified users details to the users for supporting them.