If you forgot your SIM mobile number and don’t have sufficient balance to make a call for All SIM Mobile Number Check. You can use these own mobile number check ussd codes in case of an emergency. these number check codes of various operators. There is no ussd service to check Jio SIM mobile number. Jio offers a toll-free number to check Data/SMS/Mobile number, just missed call on 1299, or either you can Download MyJio app to check