Reliance JIO USSD Codes: Check Balance, Calls & Data. Recently, Reliance Jio has announced new 4G plans and increase the number of plans. As previously we have shared, How to activate Jio Callertune, Hellotune. Now we are going to share Reliance JIO USSD Codes to Check Balance, Calls and Data, etc. Many Jio subscribers don’t no, how to check Jio data usage, Check Jio SIM mobile number, whether many subscribers facing same problem to check JioFi balance, tariff plans.