LTE connectivity.

I live in southern Quebec Canada. The LTE connection works when I’m in town but I soon as I go in the woods it doesn’t work anymore. I have done some test and send me several emergency Messages to my cell phone left at home. It works fine in town but when I go in the woods it tries to connect to LTE network it tries to send a message but it It will show the message unable to send. But I have Checked the map coverage on theGarmin website and where I go for trail running it should work, so I just don’t know. Are there others Canadians customers with the same issue, is the coverage better in United state? Is the watch itself having a hardware problem?