Be advised that in India, cash is preferred and definitely required by most merchants and restaurants, unless you are in a hotel or shopping mall. The ATM, seemingly in every nook and cranny, on every street corner in the US, is much less a fixture of life in Hyderabad. Here, the machines are most always found attached to their sponsoring banks.
A pair of machines are located in our Deloitte complex in HiTec City. They are right near the cafeteria, so convenient cash is always within reach.
The long and the short of it is that you have to that you must be a little more attentive to money management. Frequently, you'll not be able to use a credit card. Small merchants may not have quick change for big bills, so keeping small denominations on hand at all times is the rule for spontaneous purchases.