When to ask for phone verification?

1. Why do I need phone verification?
2. What does verifying your phone number do?

Why do I need phone verification?

Phone verification is used in many industries to confirm that the number provided by the client is valid and available. It can also serve as an additional way to verify the client's identity (for example, Google's two-step verification method when signing into the account using a different device than usual).

What does verifying your phone number do?

A verified phone call lets you know when a call you're receiving is actually from the number that appears on caller ID, and is not a spoofed call.