How to write Application letter to bank manager to change registered mobile number - letter writing

Application letter to bank manager to change registered mobile number

To
The manager
SBI Branch
Singur,  Natun Bazar,  Hooghly ,

               sub :  Request to update my registered mobile number.


Respected sir ,

       Be kindly informed that  , I have a savings account in your bank and the account number is__________ .  when I opened my account ,  I have given you the mobile number which I am not using presently.  So hearby  I request you to update my registered mobile number with this new
one __________  . Please change it as soon as possible so that I can do my regular transaction easily.

 SBI account number- ********
 old mobile number_******
 new mobile number-********


Thanking you
your's faithfully
 (YOUR NAME )
(date)