I am in the second billing for a new iPhone 6s. The second day of first billing showed a 1.02627 gig single data use. Turned off WiFi assist and no more large data uses rest of that month. The second day of second billing cycle showed a 1.02208 single data use, with the WiFi assist turned off. Is anyone else experiencing a once a month gig+ data use in single event with WiFi assist turned off?