With SailfishOS 18.104.22.168 (Ohijärvi) we introduced the feature of sharing your Jolla's internet connection with other devices. Your Jolla will show up on your other devices as a WLAN network that can be connected to.
Enabling the WLAN hotspot
1. Open Settings
2. Then, select "Internet sharing"
3. In the next view you can define the network name (SSID) of your network and set a password (WPA pre-shared key) for you network. The password must be at least 8 characters long.
4. When done, activate the hotspot by tapping the switch at the top of the screen.
Search for WLAN networks on your other devices, and you will find your Jolla's hotspot listed there.