Videotron is the ONLY Canadian carrier that doesn't have an SMS gateway...yet, when I subscribed to Credit card notifications from PC Financial, they were able to send me messages after specifying the carrier and the number.
As I 100% doubt the messages are sent from a mobile, there has to be a Videotron gateway, just not a public one.

Super annoying as this shortcoming forces me to do some insane mambo jambo to get messages from the alarm system ( via a paying forwarder).

Ps started the thread as this forum is starting to look like ghost town