This Is simple way to change the Mobile No. Go to Online https://employerclaims.epfoservices.in.
and Select bulk_uan_registration_form.php in Website Give Employee Name , UAn No , PF No , Cell No. afterwards it will be activated automatically
30th April 2016 From India, undefined
But How it will be Activated , as it had already activated on another number.
Hence, if we follow the procedure as you said, it will reflect result that, UAN no. is already registered on another mobile number.
30th April 2016 From India, Gandhidham
If mobile number entered wrongly, you can correct it through UAN Helpdesk on EPFO site (EPFO--> Employee Services --> UAN Helpdesk ---> Select as Member ---> Select Problem Type ---> Select Password forgot & Mobile Number change option.
Regards, Rajendra Jangid
5th May 2016 From India, Jamnagar
7th May 2018 From India, Coimbatore