WAVE Radar communicates with the device through a Wi-Fi module, and in the case of Android OS and IOS, if there is a Wi-Fi connection, it prioritizes accessing the internet through Wi-Fi. Therefore, if WAVE Radar is connected to a mobile device, internet usage is generally not possible. When using the WAVE Skills app, limited internet usage is possible if the mobile OS is set to "use cellular data."
You can use your phone as long as you have a separate cellular 5G/LTE/etc connection.