Log in to the EPFO Unified Member Portal using your UAN and password
Go to the profile or contact details section
Select the option to update or change mobile number
Enter the new mobile number
Verify the new mobile number using the OTP sent to it
Submit the request
If the portal does not allow the change, contact your employer or EPFO helpdesk
Keep your Aadhaar, UAN, and registered mobile number details ready for verification