The amount of data transmitted depends on the services or apps currently in use in the vehicle. Streaming music, for example, involves the transmission of a large amount of data, and this requires a good connection and a strong signal.
Phone to vehicle
Internet connection speed may vary depending on the location of the cellular phone in the vehicle. Move the phone closer to the center display to increase signal strength. Make sure that nothing is between the phone and center display that could be blocking the signal.
Phone to network operator
The speed of the mobile network varies depending on the coverage in the vehicle's current location. Coverage may be poorer in e.g. tunnels, mountainous areas, deep valleys or indoors. Connection speed is also dependent on the subscription you have with your service provider.
Note
Restarting the phone
If you experience any Internet connection problems, it may help to restart your phone.