TrueCaller is a popular app for smartphones which allows registered users to easily identify who is calling them. TrueCaller does so by querying there large database to identify a caller. Last year, TrueCaller revealed that it now has over 200 million users.
As part of improvement strategy, Truecaller has launched a user verification SDK (Software Development Kit) for third-party apps which will allow apps to verify users based on their information with Truecaller. As of now the SDK is only on Android and is available to registered third party apps on that platform.
TrueSDK will help users utilize their Truecaller credentials to log in to third-party apps and verify their phone numbers. TrueSDK is also free for developers to use and has no plans to charge them for the service any time soon.