I just spent a few days at my son's new house in Southern California. At his old house the 4G service and battery life were fantastic but at the new house I found that depending on where you were in the house the phone was jumping back and forth between 3G and 4G. While there, the battery life was terrible. Now I'm back at my house which is in a 3G area and battery life is back to very good. For some reason the switching back and forth wants to shorten the life of the charge.