Rather than having a code texted to you every time you sign in to your seller account, you can use an authenticator app to generate a random code that you can use to sign in and they do not require phone service or an Internet connection to work.

To download an app, go to the app store for your device or browse the Internet:

• If you're using an iOS or Android device, you can download Microsoft Authenticator or Google Authenticator from your respective app store.
• If you're using a Windows PC, tablet, or device, search for "authenticator app" in the Windows Store.
• You can also download browser-based extensions or add-ons from the Internet.

Note: Authenticator apps do not have access to your Seller Central password or account information.

You can choose one of two methods to add your seller account to the app.

Same-device sign-up

Use this method if you are installing your authenticator app on a device that doesn’t have a camera, or you're unable to use your device to scan the QR code (for example, on a PC).

• Log in to Seller Central and go to Settings > Login Settings.
• Click the Edit button next to Advanced Security Settings, and then click the Get Started button.
• Check Authenticator App when prompted to choose how you'll receive codes.
• Click on the Can't scan the bar code? link and copy the information there.
• Open your authenticator app, add a new account, and paste the information you copied. This links your app to your seller account.
• The app will automatically generate a random code that you need to re-enter on the enrolment screen under the QR code. Click Verify code and continue.
• The app will now provide new codes on a continuous basis.

Two-device sign-up

Use this method if the device you installed your authenticator app on has a camera.

• Log in to Seller Central using a computer or device that is different from the device where you installed your authenticator app. Go to Settings > Login Settings.
• Click the Edit button next to Advanced Security Settings, and then click the Get Started button.
• Check Authenticator App when prompted to choose how you'll receive codes. A QR code will display on the screen.
• Open the authenticator app on your other device and add a new account. The device's camera will activate, and you can use it to scan the QR code.
• The app will automatically generate a random code that you need to re-enter on the enrolment screen under the QR code. Click Verify code and continue.
• The app will now provide new codes on a continuous basis.

The Two-step verification FAQ help page has more details!