MFA & Verification Issues

Does Changing from a 4G to 5G SIM Affect Microsoft Authenticator?

Emma Brown Sep 29, 2026 868 views

Question details

The user wants to know if upgrading their Android phone's SIM card from 4G to 5G will disrupt Microsoft Authenticator functionality, provided the device and phone number stay the same.

Does Changing from a 4G to 5G SIM Affect Microsoft Authenticator?

Product: Microsoft Authenticator
Device & OS: Android
Scenario: Upgrading a mobile device's SIM card from a 4G network to a 5G network.
Observed behavior: The user is seeking assurance that existing multi-factor authentication (MFA) tokens, notifications, and one-time codes will continue to function correctly after the network generation upgrade.

Before you start

Before swapping your SIM card, ensure you are connected to a stable Wi-Fi network so you can verify the Authenticator app's functionality immediately after the upgrade.

Solution 1Recommended

Verifying Authenticator Functionality After a SIM Upgrade

Upgrading your SIM network generation does not inherently break the Authenticator app. Here is how to ensure it continues to work smoothly.

Microsoft Authenticator relies on the registered device hardware and an active internet connection rather than the specific mobile network generation (4G vs. 5G). As long as you are using the same device and phone number, your tokens remain safe and active.

Insert the new SIM card

Power off your Android device, swap your old 4G SIM for the new 5G SIM card, and power the device back on.

Verify cellular data

Temporarily turn off Wi-Fi in your device settings to confirm that your new 5G cellular data connection is active and working.

Check Authenticator codes

Open the Microsoft Authenticator app and check if your existing accounts and 6-digit time-based codes are still visible and actively refreshing.

Test a login

Perform a test login for one of your Microsoft accounts on a secondary device to confirm that push notifications or one-time passcodes (OTP) are being received successfully on your phone.

Verifying Authenticator Functionality After a SIM Upgrade

Internet Connection Required: If your new 5G SIM is not yet provisioned for cellular data, Microsoft Authenticator will still function perfectly as long as your phone is connected to Wi-Fi.

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Frequently Asked Questions

Do I need to re-register my device if I get a new phone along with the 5G SIM?

Yes. If you change your physical device hardware, you must set up Microsoft Authenticator on the new phone using the app's backup and recovery feature, or re-register it via your organization's security portal.

Will I lose my Authenticator backup if I change my SIM card?

No. Authenticator backups are tied securely to your personal Microsoft account (or iCloud for iOS users), not to your SIM card or mobile network provider.

Why am I not receiving Authenticator notifications after switching to 5G?

This usually happens if background data is restricted on your new cellular network connection. Ensure your mobile data is active and that the Authenticator app has permissions to use background data in your Android settings.

Does changing my phone number affect Microsoft Authenticator?

Yes. While upgrading the network (4G to 5G) does not affect it, changing your actual phone number does. If your MFA setup relies on SMS verification as a fallback, you must update your security info with your new phone number before losing access to the old one.

Login & Account Issues