I fired up my Labradar without an SD card. It worked fine, and I set up the app and connected by Bluetooth, no problems yet. As I read, the SD Card alows you to move data to a computer. Maybe you could do that with a phone that has an SD Card reader hooked up. If you are running the App, do you really need the SD Card to move data? Wouldn't the app on a phone allow you to view the data?
Danny
Danny