It is you. You need a connection, you chose the phone and the operator, you did not make sure there is a coverage area. You knew in advance that you would not be able to use this thing normally and you bought it anyway. No one forced you. You had a choice and time to think about it.

FIGH themselves, even in connection they are trying to drop everything on the buyer.
I’m buying a phone and I don’t want to think about the coverage area.
By default, the phone should work where it is sold.

And I wish you, as in an anecdote - instead of toilet paper to get a tail and a map with the indication of the nearest leash.