> For the complete documentation index, see [llms.txt](https://docs.truecaller.com/truecaller-sdk/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.truecaller.com/truecaller-sdk/why-truecaller-sdk.md).

# Why Truecaller SDK?

Here are some advantages of using Truecaller SDK:

* **Increase successful verification/ signup/ login attempts** with already mobile number verified Truecaller users.
* **Avoid user drop-off and app abandonment with** 1-tap, instant verification - without any OTP SMS whatsoever.
* **Simple, ZERO effort flow and avoid typos as** users do not even need to type mobile number.
* **Auto-fill user registration form by** capturing mapped user profile (user name, email ID, city, etc.) post their consent.
* **Achieve easy user activation and quick checkout** with less number of steps/ screens.
* **Optimize marketing spends and ROI by** by reducing user drops resulting from failed/ delayed SMS OTP and multiple steps.