Hello, I do assume so. But to be very sure, I would put this question to the supplier. I use an additional SIM card (5G) from Vodafone and it works extremely stable from the start.

Hello,
Who is supposed to answer that, please?
No user will use all European suppliers.

In any case, I have problems with three German suppliers within the EU. No reception in some cases, TP support couldn't help.
I now use other routers for mobile use.