If you go to
https://reg1.telus.net/selfcare/SelfCareApp and log in, then go to "account usage" you can see your current bandwidth usage. The limit is 10GB but they're not enforcing them. For example - in February I had almost 500% of the bandwidth cap, but I was never notified or warned in any way (I wasn't even aware of the info on bandwidth usage until I looked on dslreports.com)