By plane [edit]. The largest gateway for air travel is Frankfurt Main airport in central Germany, which offers connections to all continents and to most airports in Europe. Zurich, Munich, Vienna and Warsaw airports are a lot smaller but provide good connections to selected regional and intl. destinations.
To connect via Bluetooth, first turn on your phone or tablet's Bluetooth. When you use a new Bluetooth accessory, pair it with your phone or tablet. After pairing, devices can connect with each other automatically. Important: On a tablet that people share, each person can change the overall Bluetooth settings.
And if you are making telephone calls through your car's Sync bluetooth, or listening to music or podcasts, and you have a Sync/Cortana interaction, you sometimes lose the bluetooth connection. Some of this is not specific to Cortana, and arises out of the way WP bluetooth works.