Surprisingly good in larger cities. 100mbit in capitals fed by fibre. DSL is an option, though many communities are ultimately fed via satellite. So you'll get LTE, it's just limited to 3mbit and 600ms latency.
Pricing isn't great, and all plans have bandwidth caps of less than 500GB per month. It's do-able.
I live in northern Canada, have been to most communities up here in both Nunavut and Northwest Territories. It's GREAT, life is extremely different, but it's extremely rewarding and fulfilling.
Most people move up and either move away within 2 years, or they end up staying for a long time. I've found it to be very binary -- either you love it or hate it.
It's really not as barren as it comes across, hell, Amazon Prime ships here -- it'll just be 3-4 days instead of 1.