What is the phone for? If you want to be rescued in case of a life and death situation, then nothing beats a PLB (Personal Locator Beacon). The battery is good for 5-6 years, never has to be charged, has a built-in GPS and communicates directly with JRCC (Joint Rescue Coordination Center). The JRCC will then task either the RCMP and / or the RCAF or Coast Guard to effect the rescue. Think of it as a direct line to the 911 operator, from anywhere in the bush. It can be used anywhere in the world, not just in Canada, but the Canadian JRCC will always be the 1st to know you need help.
Also, with any Canadian beacon (don't buy one in the US, you'd have to register it with US authorities or have it reprogrammed) that is registered (they have to be registered to work as designed), you can change and update your contacts and your trip notes. So if you're going hunting, you can leave a trip note about where you are going, for how long, how many people, etc... The registration is free.
https://www.cbr-rcb.ca/cbr/presentation/other_autre/index.php
The SARSAT network has much better coverage than the network used by the SPOT beacons. A PLB is normally picked up within 2 mins of activation, a SPOT beacon can take from 2 mins up to an hour to be detected by their network, dependent on where you are in Canada and how their satellite constellation is doing (some missing satellites). Also with a SPOT, you have to ensure you have fresh lithium batteries installed before you set out, then ad the cost of the monthly subscription. The Delorme In Reach is another good option, but again relies upon the user to replace the batteries.
PLB: $300 one time cost, no monthly subscription
SPOT: $85-$200, $10-15 per month + batteries
In-Reach: $300, $17-70 per month + batteries
Cell phone: $ cheap, but will it work when you really need it?
To me, it's a no brainer. I use a PLB for hunting, fishing, dirt bike riding, flying, sailing and camping in the back country. When I'm out solo, it's always attached to my belt (in a compact camera case). Most devices can now be activated one handed.