Indian Overseas Bank customers will first have to make sure that their numbers are registered to make use of this service. Just send the following SMS format from your mobile number that has been registered with the Bank- ACT<space>Your Account Number- to the number- +919551099007. This will enable your mobile number to make use of the missed call balance enquiry service.
After that, just call the number- 04442220004. The call will get disconnected after after a few rings. The Bank will then send an SMS containing the Customer’s Account Balance details to the registered mobile number.