# Implementing user flow for your Mobile Website
While you start integrating Truecaller SDK, as the very first step, it is important to work on designing the right user flow, so that you can achieve desired results.
Truecaller SDK is a mobile number verification service, without the need for any OTP whatsoever.
The right way to implement Truecaller SDK on your mobile web, is to invoke mobile number verification via Truecaller at touch points, where you have your users to sign-up/ login/ checkout by verifying their mobile numbers.
Let us now see an example to understand how to effectively use Truecaller SDK at such touch points in your user journey
Users on CarDekho - India’s largest online auto discovery and classifieds platform, can browse for new cars, access details and more on CarDekho mSite. However, when users wish to take a test ride, get more details, request for car loan offers, and more, it requires users to verify their mobile number to ensure valid users are accessing such details.
From the above flow, we can see that for Truecaller users, signup is mere 1-step process without needing any OTP; while for non-Truecaller users the signup process is tedious, and involves many steps, and thus more possibilities of drop-offs.
**Building for various touch points**
**a. User signup/ login via mobile number**\
Example : Intrcity - India’s first SmartBus for safe inter-city travel
In order to complete your ticket booking on Intrcity’s mobile website, users need to verify their number in order to signup/ login into their accounts. Mobile number being an important part of the user profile, Intrcity uses Truecaller to quickly verify mobile number, and auto-fill certain parts of the user profile to reduce user effort and save time.
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