I bought my Samsung U700 at April from day on purchase it's Battory backup is not good it is going off if I didn't charge for every 10 hours basically I am using this phone as official purpose only I don't get calls every minute. I am very unsatisfied with Model, when I browse in net this model features saying it is having backup up to 270/230 hours but it is not giving backup up to 10 hours. How can I resolve this problem. Plz advise smb!