They must be able to tell by the IMEI because I have never told them it’s and L5, only after I couldn’t get VoLTE to work so I don’t think it’s true that they cannot tell. Also in order to have data a MAC address is required and that can easily be parsed to discover the manufacture of the modem. They could easily exclude by OUI number.
Regardless, I think something will have to give here or “rogue” devices like the L5 will be left outside the walled garden that the globalist machine is trying to create. Soon we’ll need digital ID’s to get internet access, so police can show up at your door for wrongthink more easily.