I see the following message when using the Lingo app: Biosensor Already in Use What it may mean: The Lingo Biosensor was started by another device. What to do: Check again with the device that started it. Or apply and start a new Lingo Biosensor. Related articles I see the following message when using the Lingo app: Biosensor incompatible I see the following message when using the Lingo app: Pairing error What if my glucose reading is higher or lower than I expect? Are all spikes the same?