You can use the Philips Hue Bridge and the associated lamps at home despite the lack of WiFi, but there are some limitations:

- The Bridge must be connected to your router, even if there is no active internet available. This enables local control of the lights within your network.
- You can control the lamps, adjust their brightness and colour temperature and switch them on and off as long as the bridge and the lamps are on the same network.
- Automations, such as automatically switching on and dimming the lights at sunset and sunrise, can work without an internet connection if these rules are already stored in the Bridge.

However, some functions will not work without an internet connection, such as remote connections, security updates and learning new accessories in some cases.

So if you only have a mobile hotspot that you only use occasionally, you can use the Bridge's local control functions as soon as you are on the same network. However, it is advisable to connect to the Internet occasionally to ensure that all functions and updates are working properly.