No. Vespera uses a Wi-Fi network to communicate with your smartphone, but that doesn't mean it needs an Internet connection. When you install the instrument, you simply need to go to your Wi-Fi settings and connect to the signal emitted by Vespera (similar to Bluetooth on other devices).
You only need the Internet to :
- create your account or connect to it,
- share your images on social networks,
- update the application.
Please note that in order to continue surfing the Internet, you will need to use the Data network (4G) of your phone as the Wi-Fi network will already be used by Vespera.