How to Add Trusted Phone Numbers to Apple Account

With two-factor authentication, a trusted phone number or trusted device helps verify your identity when you sign in to a new device or browser.
The Next Web

Verifying phone numbers: why do in-house what someone else can do better?

Phone number verification is the process of verifying that a phone number is valid, reachable and accessible by the user. It is also a popular measure that can be applied to any service or application ...
The Nation Newspaper

Temporary Phone Number for Verification

Online verification has become a big part of how we stay safe and private on the web. Every app, website, or service now wants to confirm you’re real. But giving out your personal number can be risky.