Find Current Active Plan for BSNL Prepaid Mobile Number

Hello, I was receiving a lot of requests to find an easy way to Extend Validity of BSNL Prepaid Mobile Number. I have written one method over here but it works best only with BSNL Mobile Number of Gujarat Circle. Today, I'll post a method which works all over India and any BSNL Prepaid Number can use this method to find the currently active plan …