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Regarding SMS reminders - please make sure that your phone number is entered in a correct format such as: +48123456789 - a plus sign, the country code and your number without any spaces or dashes.
As you edit the number, please select "International" as your carrier and pick one of the Canadian hosts from the "number to send from" drop-down menu and then repeat the test, preferably once through each hosts.
Regarding push notifications - is your device on the list in Settings -> Reminders? Did you try to send a test or just set up a task with a reminder? If you've used a task - what was its due date and due time exactly?