Dial 199 from your Jio number and check the caller details on the screen
Dial 1299 for Jio balance and account details
Use the MyJio app and view your mobile number on the home screen
Check the SIM card pack or welcome kit for the Jio number
Call or message another phone and see the number displayed
Dial *1# if your Jio SIM supports it
Check your phone settings under SIM or About Phone
Visit a Jio Store with valid ID proof to confirm your number