I was just reading the wireless industry news and I've put my hands on this article : http://9to5mac.com/2014/12/16/tmobile-uncarrier-8-data-stash-rollover/
“Can you imagine your gas station siphoning unused gas from your car each month? The US (<< read CANADA, it's worse then US IMO) wireless industry is even worse,” said John Legere, president and CEO for T-Mobile. “Americans have been gamed by the carriers into buying huge data plans – all to avoid getting screwed with overage penalties. Only to find out they bought more than they need which is then confiscated by the carrier. For the consumer it’s lose, lose. The best thing, T-Mobile offers it for FREE! What about some revolution Koodo? Seems like it's the good time, X-mas is coming! We pay for 1Gb per month right? Then why should we loose it the next month. It doesn't make sense that prepaid users get this, but postpaid don't. What if I leave in vacation for one month and still pay for my phone? I've paid for nothing even if I didn't use it!!!