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.
Polygon

Overwatch 2: How to add a phone number for Blizzard’s SMS Protect

If you want to play Overwatch 2 when it’s released on Oct. 4, you’ll be required to enter your phone number as part of Activision Blizzard’s SMS Protect feature. The same goes for Call of Duty: Modern ...