Yes. A 5G router can normally use both 5G and 4G.
If no 5G is available where you are or the 5G signal is too weak, the router can automatically switch to 4G. This makes a 5G router more flexible than an older router that only supports 4G.
When 5G is available, you usually get more capacity and higher speed, but the router can still use 4G when needed.
This is one of the reasons why we recommend a 5G router for travel in Europe: you can use both 5G and 4G networks, depending on what works best where you are.
4G and 5G in practice
It is normal for a 5G router to use 4G, and it does not mean that it is faulty. The router chooses the network based on what is available and what gives a usable connection. In some places 4G is more stable, in others 5G can be much faster.
What affects speed
Mobile speed does not only depend on whether the display says 4G or 5G. Distance to the mast, frequency band, obstacles, network load, placement and the operator used can make a big difference. So a stable 4G network can sometimes give a better result than a weak 5G network.
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