If you would like your bank to update your records with the new mobile number, here is a sample template you can use to write a change in mobile number letter to your bank.
Subject: Change in Mobile Number
This is to inform you that I would like to change the mobile number currently registered to my bank account. I do not have access to the mobile number which I had previously registered. Therefore, I wish to replace my old registered number [number] with my new number [number].
I hope you can understand my situation and process my request immediately. I am ready to provide any document that is required for this process. Please acknowledge this letter along with the expected date of the successful change of my number. Your kind response would be appreciated.
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