I set it up where the cellular data stays off when my screen is off, but still turns on for 15 min every 4 hours so it can briefly sync and grab emails. I do this by creating blocks of time (military time) 0815 to 1200, 1215 to 1600, 1615 to 2000, and so on. I just label them as time slot a, b, c, and so forth. Then I add all those time slots to my triggers along with display off, and set action to turn off cellular data, turn off wifi, turn off GPS. Now my radios stay off when my phone screen is off, except turning on for short periods every 4 hours to grab my email. But I can still receive calls and texts anytime.
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