Yes, you can use the TP-Link Deco E4 even if you receive the Internet via LTE. The Deco E4 works regardless of the type of Internet connection you have and can work with any Internet Service Provider (ISP) and modem, including LTE modems.

However, it is important to note that the Deco E4 does not have a built-in LTE function, so you will need a separate LTE modem to establish the Internet connection. You can then connect the Deco E4 to this modem to create a mesh Wi-Fi network in your home.