No, your mobile device does not need to connect to internet for it to work and connect your Sensor. The OvuSense App will work offline for up to 30 days and you will receive a number of warnings up to that point that they need to connect to the internet:

• After 14 days and for each day until day 22: ”
• After 22 days and for each day until day 31: ”
• After 31 days: ”

Beyond day 30 all your previous data will be retained by the OvuSense App but you will no longer be able to connect your OvuSense Sensor until you have connected to the internet again.