Two-factor authentication for Apple ID - Apple Support
support.apple.com › en-us › HT204915Dec 08, 2020 · Turn on two-factor authentication on your iPhone, iPad, or iPod touch Go to Settings > [your name] > Password & Security. Tap Turn On Two-Factor Authentication. Tap Continue. Enter the phone number where you want to receive verification codes when you sign in. You can choose to receive the codes by text message or automated phone call. Tap Next.