In order to port your number to Jio follow the following procedure:
To port in, SMS PORT <10-digit mobile number> to 1900 from your existing number that needs to be ported to Jio
You will get an SMS that will contain the UPC code and its expiry date
Download MyJio app from Play Store or App Store and generate Jio coupon code
Walk in to nearest Jio stores or Reliance Digital/Jio retailer with the UPC (Unique porting code) code and your Jio coupon code along with the handset
P.S. Carry your Aadhaar Card number and activate your Jio connection through eKYC process.