Use APKPure App
Get OTP Viewer old version APK for Android
Simple way to view your OTP password as popup.
Since all the transactions are done using OTP, this application just shows the OTP in the screen once it arrives.
You don't want to navigate to messaging app to view your OTP.
As this application doesn't have INTERNET PERMISSION , it is secure to use this app.
You have view the permission list when you install this app in playstore.
Your security is our concern.