Just got my phone back from being repaired and the battery performance seems a bit worse. After various experiments the only thing that really stands out as concerning is the amount of Wifi data OS Services uses in a day. Also it seems that it is nearly constantly downloading small amounts of data, which I think contributes to the battery drain considerably. I've FR just in case something odd was on there, but it would be really useful as an indication if people could tell me how much per day OS Services uses for them. I've installed the My Data Manager app to help me keep track. thanks.