As a traveller you will sometimes visit places that lack any form of enhanced technology. So it could happen that there's no Wi-Fi. In that case, you can always rely on the principle of 'roaming'.
This is a general term that refers to the extending of connectivity service in a location that is different from the home location where the service was registered.
Roaming occurs when a subscriber of one wireless service provider uses the facilities of another wireless service provider. Keep in mind that roaming services are much more expensive than using your own network at home.