Sub request letter for change of mobile number respected sir it is humbly requested that i own current account number 000 123 456 in your bank i am also availing your mobile banking service i have recently changed my mobile number to 9contact number kindly update my new number in your record so that i can avail services without any . Tap on mobile number registration and select either new registration or change mobile number as you may desire provide the mobile number that you desire to change link in the designated field provide your verification regarding the mobile number and select incorrect or correct. Application for change in mobile number customer name customer id old mobile no new mobile no the above details would get updated only in all accounts fixed deposits held with the bank the details for credit card loans will not get updated customer . Change contact number with hdfc mobile banking if online banking is not something you are used to and you happen to use phone banking or hdfc mobile banking service already you have option to update your residence and company phone number from hdfc mobile banking app you can do so by logging into your app your profile personal profile