I want to make sure my Android does not use more data traffic than what my plan allows. My plan is as follows It allows unlimited usage from 17:00 in the evening to 08:00 in the morning, and all of saturday and sunday. But during weekdays office hours 08:00 to 17:00 data traffic is VERY expensive (at least for my wallet). So what I want is a good technical solution (not manually turing on and off) for making absolutely sure there is ZERO data traffic during the expensive periods, incoming or outgoing, but full access during the free periods. SCHEDULE Mon-fri 08:00-17:00 = NO DATA TRAFFIC AT ALL All other times = FULL DATA ACCESS Can I do this by installing an App? Which one? Can I do this if I get the proper version of Android? Which version has it? Can I do this if I install a custom ROM? Which one? Thank you.