Visit the EPFO Member e-Sewa portal
Log in using your UAN and password
Go to the Manage section
Select Contact Details
Click on Change Mobile Number
Enter your new mobile number
Verify the number using OTP sent to the new mobile
Submit the request
If your UAN is not active, first activate it on the portal
If you cannot access the portal, contact your employer or EPFO helpdesk
You can also update mobile number through the UMANG app if linked with your UAN