Luma uses your modem to get your Internet service into your home. As your modem acts as a gateway for service, Luma can easily then replace your existing router but not your modem.
The first Luma plugs into your modem to provide your WiFi network Internet access. Other Luma devices wirelessly connect seamlessly to the first to surround your home in WiFi.
If you have any other questions, please feel free to reach out to Support via email at [email protected], via phone at 800.684.LUMA, or via live Chat through the Luma app directly.