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 . 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 . How to change update mobile number in hdfc bank change phone number with hdfc netbanking if youre not sure how to change registered mobile number in hdfc online banking here is the quickest way note that not all customer categories are allowed to do this online and you may have to try mobile banking and application form is you are a . 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