SB001 Technical Error Yono | Steps to Fix

SB001 is a technical error code in the Yono SBI app that usually indicates a SIM Binding failure. The app is trying to verify that the SIM card in your phone matches the mobile number registered with your bank account, but it is failing to send or receive the necessary security data.

Here is how to fix it, ranked from the most common solutions to the more technical ones.

Steps to Fix

1. Check Your SMS Balance (Most Common Cause)

Yono needs to send a silent SMS to verify your device. If you cannot send outgoing SMS messages, you will get this error.

• The Fix: Ensure you have a valid recharge plan. Even if you have unlimited data, some entry-level plans do not include outgoing SMS, or you may need a main account balance to send the message.

2. Disable Wi-Fi & Use Mobile Data

SIM verification often fails if you are connected to Wi-Fi because the app cannot directly read the mobile network data to “bind” the device.

• The Fix: Turn off Wi-Fi completely. Turn on your Mobile Data (make sure it’s the data from the registered SIM) and try logging in again.

3. Ensure SIM is in Slot 1

While many modern phones are dual-SIM active, banking apps are notoriously fussy about this.

• The Fix: If you have two SIM cards, ensure your SBI-registered mobile number is in SIM Slot 1. If possible, temporarily disable the second SIM in your phone settings while you complete the registration.

4. Clear App Cache

Old data might be conflicting with the current login attempt.

• Android: Go to Settings > Apps > Yono SBI > Storage > Clear Cache (and Clear Data if cache doesn’t work).

• iOS: You may need to uninstall and reinstall the app to fully clear the cache.

5. Check Date & Time Settings

If your phone’s time does not match the bank server’s time exactly, the security handshake will fail.

• The Fix: Go to Settings and set your Date & Time to “Automatic” or “Network Provided Time.”

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Summary Checklist

1. Turn off Wi-Fi.

2. Enable Mobile Data on the registered SIM.

3. Confirm you can send an SMS (try sending a text to a friend).

4. Clear App Cache.

5. Retry the login.

Note: If you try all the above and still see the error, it is likely a temporary server outage at SBI. Wait 2–4 hours and try again.