# Combined Number Lookup and Verification

Combine Number Lookup with our Verification API to:

- **Ensure delivery:** Verify that OTPs reach legitimate users.
- **Reduce churn:** Minimize errors and frustrations in verification steps.
- **Increase security:** Flag risky numbers and streamline authentication workflows.


Number Lookup provides real-time, port-corrected carrier and line type information, enhancing verification services by identifying the best communication channel, optimizing OTP workflows, avoiding unnecessary messages, and detecting fraudulent activities.

Click [here](/docs/verification/) to learn more about Verification API.

## Verification Workflow

**Landline Number Verification**

| Identification | Action |
|  --- | --- |
| If the number is identified as a landline, it cannot receive SMS OTPs. | The best way to verify this number is through a voice call. |


**Mobile Number Verification**

| Identification | Action |
|  --- | --- |
| If the number is identified as a mobile number, it can receive both SMS and voice calls. | Depending on the preferred communication channel, the business can choose to send the OTP via SMS or call. |


**VoIP Number Verification**

| Identification | Action |
|  --- | --- |
| If the number is identified as a VoIP number, it is often associated with a higher risk of fraud or bot activity. | To ensure the user is legitimate, add an extra validation step, such as a CAPTCHA, before sending the OTP. This helps verify that the request is coming from a real user and not a bot. |


## Benefits

By integrating number lookup with your verification process, you can optimize the delivery of OTPs, improve security measures, and enhance communication efficiency.

- **Efficient communication:** Identifies the best communication channel, ensuring OTPs reach the user effectively.
- **Cost savings:** Avoids sending unnecessary messages to inappropriate numbers (e.g., SMS to landlines).
- **Fraud detection:** Helps identify and mitigate potential fraudulent activities by recognizing high-risk numbers like VoIP.
- **Improved user experience:** Tailors the verification process to suit the user's number type, enhancing the overall experience.