A Sensor that has been removed or that has fallen off cannot be reused. Users should replace the Sensor and start a new Sensor. The FreeStyle LibreLink app or reader will identify that it is a new Sensor and ask users if they want to start it.  If a sensor falls off or stops working before the end of the 14 days, please call 01-426-801 using a landline, and upon hearing "Please enter the number you are calling now", dial the number 855-583-3354 to speak to one of our Customer Care agents.