As far as I'm aware you can only add an internet hotspot by purchasing a Data Package from VW's partner company Cubic Telecom. This can be done via the WeConnect app or directly from the car's infotainment screen. I purchased an 8GB / 1 month pack for £9.99 just to try it out. It seemed to work fine but if you connect your phone via rSAP (Remove SIM Access Protocol / "Business Telephone"), it overrides the data package and uses your phones data instead. You also need to switch off WLAN in the infortainment settings otherwise the hotspot isn't available. I have a large data bundle with my phone and an app to start my phone's hotspot as soon as it connects to the car's bluetooth so I just use my phone's data instead to power the CarNet functions, satellite view for the sat nav and internet traffic information.