Hey, Volunteering in Africa, data on the phone is expensive! Trying to only have Mail active, but so the phone only checks when I go into Mail, and only Facebook, Message, Whatsapp etc when I go into it. I keep running out of my daily 25 meg allowance. I have tried to turn off all apps in the background but think they must still be on. Background App Refresh is disabled. Not sure what else I should do? Thanks in advance.