Many websites and apps rely on a weak form of two-factor authentication (2FA) that involves texting you a short number or code. These sites and apps might also offer to make an automated voice call that reads the code aloud. If you’re outside your home country or region and have an expensive fee per message to receive SMSes or per minute for voice calls or cannot receive them at all, you need an alternative.
Set up an app-based second factor in Passwords or elsewhere
Your best option is to upgrade account security for the service that currently sends you an SMS for verification. Look for a way to add two-factor authentication that might be labeled as specifically as “use Google Authenticator” (you can use other apps or Apple’s Passwords app), shown as a QR code, or require navigating through security > two-factor authentication or other menus.
Read more at Macworld.com