@Palone Yes, this is the correct thread.
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@cat
If you are referring to the Bouygues 4G router, there is indeed an RJ11 (phone) connector on the back but it does nothing – that facility has not been implemented by Bouygues. You can check the router model by looking at the underside – it will in all probability be the B528 model. The other, bigger socket shown (the top one) is for an RJ45 Ethernet cable to attach a data switch
It is correct that other 4G routers allow the use of a wired phone but not with the Bouygues 4G SIM.
The possible reason it won’t work in a different location is that it has already been registered to a 4G mast close to your sister and the contract restricts the device to a single location. That said, at the new location, it might not work because it hasn’t registered itself on the new mast location and you might first need to do a hard reset of the device (which will lose any settings your sister may have made, there is a small hole in the base of the device next to where the SIM is insrted which gives access to the reset switch – you need a paper clip or similar to poke in the hole and hold for a few seconds to achieve and the device needs to be on). IIRC, The B528 doesn’t require any code to connect to the mast (that’s the function of the SIM card) but to connect by WiFi to the device you will need the know the WiFi key which is printed on the bottom of the device (unless it has been changed by logging in to the device with a computer with the default IP address 192.168.1.1
I hope that helps.
Finally, just to clarify… I think you are confusing the two aspects of the 4G Router – the first aspect is that the router connects to the nearest 4G mast via the SIM to provide an internet service; the second aspect is that in the home, the 4G router (once connected to the 4G mast) provides a WiFi signal which allows laptops and other devices to connect wirelessly (or by Ethernet if connected directly to the router or through a data switch) to it. A mobile phone will still connect to the nearest 4G mast for a phone signal but internet services (such as a browser on a smartphone) will connect by WiFi to the router if in range.
To example this, I can connect my OnePlus smartphone to the local 4G mast by turning off WiFi on my phone and it will ostensibly obtain the same strength of signal from the 4G mast as will the router. However, even if WiFi on my OnePlus is turned on, any telephone calls will be made through the 4G mast – not the 4G router.
If the router is not placed in a good position internally, the signal to the 4G mast may be compromised. My house is wood frame and works well to the mast 1.2Km away but if my house was a massive stone construction it might not work so well.
Sorry for a lengthy explanation, but I hope it makes things more clear.