A portable WiFi router is just like your internet box at home, but instead of being attached to a phone cable, they have a SIM card inside instead. If you get an 'unlocked' portable WiFi device, this means you can use any SIM card, from anywhere in the world, inside it.

If you already have a smartphone, you already have a (potentially free) mobile hotspot at your disposal. Modern Android and iPhones come with a built-in option to turn your cellular data connection into Wi-Fi for up to five other devices. On many plans this can cost up to $25 extra per month.

You can connect devices together via WiFi and a router directly, without the internet. My printer is connected via WiFi via a router so I can print anywhere my WiFi covers, without the internet. WiFi is a network system like Ethernet. You will even now have a neighborhood network without the Internet connection.