Hello Vishwajeet,

If your registered email ID and phone number are no longer accessible, and you need to retrieve your barcode using only your roll number, you have a few options:

1. Visit the Official Portal: Go to the official website where you originally registered. Some portals allow you to retrieve information using alternate details like your roll number.
   
   

2. Contact Support: Most exam boards or registration portals have a helpline or email support for issues like these. Contact them, explain your situation, and provide your roll number. They may ask for additional information to verify your identity.
   
   

3. Visit the Institution or Exam Center: If support is unavailable online, you can visit the exam center or institution in person with your ID and roll number to request assistance in retrieving your barcode.

This should help you recover your registration details.

I hope this answer helps you. If you have more queries then feel free to share your questions with us we will be happy to assist you.

Thank you and wishing you all the best for your bright future.