This change is announced by jio based on the instructions from telecom regulatory authority of India. I got a notification on my mobile phone to jio sharing update that on 10th of October call soon on jio mobile numbers will be charged at 6 paise per minute however it will be free for all jio to jio calling.
Company also mentioned that this is a temporary change as per the compliance by the government department and valid till 31st December 2019. Now jio customers has to pay first time Since its launch but good thing is that it's only for the limited period of maximum three months time..Thank you so much.