Are you sure about mobile number in ATM..since I have changed my mobile number recently.I never came across this option in ICICI ATM.IndianMascot said:But to do that one have to visit the bank which is absurd. If they can allow us 3rd party transfer through net banking then why not allow to change the details online. They anyways validate by calling or sms. And why only form? Why can't they accept the letter with specimen signature and identity proof copy. Moreover ICICI is quite easy and number can be updated from any ATM.