In case you want to link your mobile number to your EPF account, you can do so by accessing the EPFO portal.
1, Visit the EPF Member Portal.
2. Click on “Activate UAN”.
3. Enter your UAN, name, date of birth, mobile number, and email id
4. Now click on “Get Authorization Pin”
5. An OTP will be sent to your mobile number. Enter the OTP to activate your UAN and this mobile number will also be registered with your EPF