If you need something more comprehensive you could use this app:https://www.opensignal.com/ It shows a lot of analytical data about the service and coverage. Or if you just want to see the coverage map: https://www.publicmobile.ca/en/on/coverage this...
If you recently join public mobile and ported your number, it may take a couple hours before all your services will work (2.5 - 3 hours) If it takes longer or it's a different scenario you would need to contact a moderator and they will refresh your ...
