THese steps can be followed for any Telecom Operator & will work for sure! Only extra thing you need to do on your smartphone is to generate the BARCODE!
1) To port in, send PORT Mobile Number to 1900 from your existing number which needs to be ported to Jio.
2) Download MyJio app from Play Store and generate offer code.
3) Walk in to any of the Reliance Digital / Dx Mini / Preferred Jio retailer or prominent multi-brand Jio stores with the port out code and your Free Welcome Offer code along with the handset.
4) You will need to submit a copy of Proof of Address, Proof of Identity and a photograph for availing your Jio SIM.
Confused about generating bar code?
Watch the video – https://youtu.be/KIngO9R9voc