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I have update my new mobile number in my credit card account but still the OTP is received on my previous mobile number. What should I do?
If your new mobile number is already updated in the credit card account, to receive OTP alerts on the new mobile number you need to follow below process:

Log on to www.icicibank.com> Personal > Apply online > Cards > 3D Secure PIN for Debit Card > Register > New User - Register Now> I Accept > Enter debit card number > Next > Select OTP > Next >

If your old mobile number reflecting under ' Below is the information stored in our database ' then select ' My details do not match' option under ' Please select your preferred option to receive the OTP ' > Next > your new mobile number will be updated.
After this process every time while you making the transaction OTP will be sent only on your new register mobile number.