Dial 1299 from your Jio number and your number will be announced
Dial *1# from your Jio SIM if the USSD code works on your device
Call another phone and check the caller ID
Send a missed call or SMS to another number and see your Jio number on that device
Check the SIM pack or welcome letter if you still have it
Log in to Jio’s website with your mobile number if you remember it
Contact Jio customer care from another phone and ask for your number after verification