This major Gmail change will certainly take some getting used to if you rely on SMS codes for authentication. It’s worth noting that you can already use a trusted device like your phone or tablet to log into your account so that you don’t have to be bothered with entering an authentication code each time you log into your account.

Google will soon change how you’ll authenticate your Gmail account. Instead of the familiar SMS security code, Google is moving to a more secure method. Moving From SMS to QR Codes for Gmail Authentication First reported by Forbes,

Google is about to overhaul the login procedure for nearly 2 billion Gmail users as part of a major security update to its email service. The current method of sending an SMS text message to verify a user’s identity will be phased out “over the next few months”,