The application requires a network signal to send and receive data only, once data is received on the device it does not need signal for the user to collect data.
The application is designed to work offline with all data stored on the device and automatically sent to the servers as soon as a network signal (WiFi or mobile) is available.
All data stored on the device contains a time stamp that is taken when the user captures the data. ie 'At pick up', Delivered, etc. Not when the signal is transmitted.
Therefore actual times are recorded.
The data is not removed from the device until it has been secured on a server.