Hey @jgrsnts,
We certainly do send notifications for data, you'll receive one once you reach 90% of the data in your plan and another one at 100%.
We also send you a notification if ever you reach $50 in data overages and at that point we also block the data. You can always continue using it by consenting and restoring the data through My Account.
To avoid going over, you can track your usage through My Account on Fido.ca or the App, or by calling *3337 from your phone.
Hope this helps 
