Security · Oct 2026 · 2 min read

Setting up two-factor authentication without locking yourself out

Two-factor authentication is one of the best protections for your accounts. Set it up with a way back in.

Two-factor authentication asks for something you have, such as a code from your phone, in addition to your password. Even if your password leaks, an attacker still cannot sign in.

Where you can, use an authenticator app or a passkey rather than text messages. Codes sent by text message are better than nothing, but they can be intercepted or lost when a phone number is moved to another SIM card.

When you turn on two-factor authentication, most services show backup codes. Save them somewhere safe and offline, such as printed and stored with your important papers, or in a password manager. They are your way back in if you lose your phone.

If the service allows it, add a second method, such as a second device or a security key. Losing a single phone should never lock you out of everything.

Never share a two-factor code with anyone who contacts you, whatever they claim to be. Genuine support never asks for these codes, and at KC Software Support we never do.