This 4G router replaced my fixed line broadband. It is important to choose a mobile network with a good signal.
I have connected a VOIP telephone service provided by "SOHO66", via an analoge telephone adaptor, a ring adaptor and a ordinary telephone to the 4G router (instead of a VOIP telephone).
The number of ethernet ports can be increased from 2 by using an unmanaged data switch (5 way/8 way).
This thing is so fast it is incredible, the router cannot achieve full 5G in its current location but still multi streams at 300 Mbps, I did cheat and buy a 3 Amp transformer for it from Amazon for £8, picture Ans sound from it is a legend