Log in to your IRCTC account
Go to the profile or account settings section
Select the option to edit personal details
Check if mobile number editing is allowed in your account
If editable, enter the new mobile number
Verify the new number using the OTP sent to it
Save the changes
If mobile number cannot be changed online, contact IRCTC customer support
Use the IRCTC helpline or official support email for assistance
Keep your registered email ID and ID proof ready if asked for verification
