Android Data Upload

On the App Settings page, there's a checkbox titled "Allow data upload over a cellular data plan."

• The default behavior (box unchecked) is that the app will upload data only when the phone is connected to WiFi. This is because the data files (especially the accelerometer data files) can be very large, and we're concerned about using too much data on a study participant's data plan and incurring extra costs for them.

• If the box is checked, the app will upload data when the phone has an internet connection, regardless of whether that connection is WiFi or cellular data. A phone only has one type of internet connection at a time, and default phone behavior is usually to prioritize connecting to a known WiFi network over connecting to a cellular network.