The Per Diem Plus app will still work even if a users turns off their cell service to avoid domestic and international roaming charges.

• Leave the device powered on
• Turn on "Airplane Mode"
• The PDP app will work in the background collecting GPS location and trip data
• The trip data will be uploaded to the PDP servers once a user reconnects to cell service and turns off "Airplane Mode"
• Note: This hack will work on most devices