Check the welcome kit or account opening documents from ICICI Bank
Look for the User ID in the email or SMS sent by ICICI Bank during registration
Open the ICICI Bank iMobile app and use the forgot User ID option
Visit the ICICI Bank internet banking login page and select forgot User ID
Contact ICICI Bank customer care and verify your identity to retrieve the User ID
Visit the nearest ICICI Bank branch with valid ID proof to get assistance
Check any previous internet banking activation confirmation message or letter from ICICI Bank