The 4g router works randomly: with my laptop (Ubuntu) I can connect but often internet is not usable (very slow or not working at al). If I connect to the router with my Android phone, it's usually better.

If I remove the SIM card from the router and put it in my phone and connect my laptop to the hotspot, then no problems at all (the SIM works).

If I test the speed of the connection I see a very slow Download speed (1 Mbps) and a relatively fast Upload speed (30 Mbps). If I place the same sim card in the phone, and connect to the hotspot and run the speed test again, the results are more omogeneus (6 Mbps in both download and upload).

It looks like that some settings of the router are messing up with a otherwise working simcard.... I restored the factory settings but nothing changed.

Is there a way to replicate my Android settings on the router? That same simcard inside the phone works as a charm

I am in north Italy, the provider name is Iliad.