@SATFAN bro, even if you can't use that app, just do not hesitate to go to nearby Jio Store and convert to Prepaid. It is totally worth it, imho. I have just done that today and it took hardly 15 to 20 mins max. You may need to pay the bill amount due (un-billed one up to today - pro-rata basis) and need to have aadhar in hand. They will take photo and few fingerprints. Finally you may need to pay (digitally - not cash) for the FRC (different for 4G and 5G). No need to change SIM, no SMS stoppage, no need to re-activate UPI apps like SIM change. This even works for eSIM as well. I am using Jio as eSIM number in my Samsung A55.