For what it is worth, I have mine set for LTE/CDMA as an experiment to hopefully catch the LTE towers when they turn on in the DC area. Surprisingly, I have noted NO decrease in battery life in this dual mode. I really can't get over how well the battery lasts on this phone. With my HTC EVO 4G I had to have it plugged into the car charger (even with a new battery) if I made calls or used navigation as those two things would chew up battery life. But the battery and performance of the S3 just lasts and lasts and lasts - I make long phone calls via blue tooth driving between offices and use navigation and the battery hardly moves - this is a truly amazing device - I don't even use my car charger anymore.